Cukrzyca – Diagnostyka i diagnoza

Cukrzyca
Diagnostyka i diagnoza

Diagnostyka cukrzycy opiera się na pomiarach glikemii i hemoglobiny glikowanej (HbA1c) z ustalonymi progami diagnostycznymi: glikemia na czczo ≥ 126 mg/dl (7,0 mmol/l), glikemia po 2 godzinach w OGTT ≥ 200 mg/dl (11,1 mmol/l), przygodne stężenie glukozy ≥ 200 mg/dl (11,1 mmol/l) z objawami hiperglikemii oraz HbA1c ≥ 6,5% (48 mmol/mol). Stan przedcukrzycowy definiuje się jako glikemię na czczo 100-125 mg/dl (5,6-6,9 mmol/l), nieprawidłową tolerancję glukozy w 2 godzinie OGTT 140-199 mg/dl (7,8-11,0 mmol/l) oraz HbA1c 5,7-6,4% (39-47 mmol/mol). Diagnostyka cukrzycy typu 1 wymaga dodatkowo oznaczenia autoprzeciwciał (ICA, anty-GAD65, IAA, IA-2, ZnT8) oraz peptydu C, natomiast w cukrzycy typu 2 kluczowe jest badanie przesiewowe u osób z czynnikami ryzyka (wiek >35 lat, BMI ≥ 25 kg/m² lub ≥ 23 kg/m² u Azjatów, nadciśnienie, dyslipidemia, wywiad rodzinny). Cukrzyca ciążowa diagnozowana jest najczęściej między 24. a 28. tygodniem ciąży za pomocą testu przesiewowego z 50 g glukozy i OGTT z 75 g glukozy, gdzie stężenie glukozy po 2 godzinach ≥ 140 mg/dl (7,8 mmol/l) wskazuje na rozpoznanie.

Diagnostyka cukrzycy

Cukrzyca to przewlekła choroba charakteryzująca się podwyższonym poziomem glukozy we krwi (hiperglikemią), spowodowana upośledzeniem wydzielania insuliny, nieprawidłowym działaniem insuliny lub obiema tymi przyczynami. Diagnoza cukrzycy opiera się na badaniach laboratoryjnych mierzących poziom glukozy we krwi lub hemoglobiny glikowanej (HbA1c). W artykule omówione zostaną szczegółowo metody diagnostyczne stosowane w rozpoznawaniu różnych typów cukrzycy.¹²

Kryteria diagnostyczne cukrzycy

Rozpoznanie cukrzycy może być postawione na podstawie jednego z następujących kryteriów:¹²³

Stężenie glukozy w osoczu na czczo ≥ 126 mg/dl (7,0 mmol/l)
Stężenie glukozy w osoczu po 2 godzinach w doustnym teście tolerancji glukozy (OGTT) ≥ 200 mg/dl (11,1 mmol/l)
Przygodne stężenie glukozy w osoczu ≥ 200 mg/dl (11,1 mmol/l) u osoby z klasycznymi objawami hiperglikemii
Wartość hemoglobiny glikowanej (HbA1c) ≥ 6,5% (48 mmol/mol)

Potwierdzenie diagnozy cukrzycy wymaga powtórzenia badania w innym dniu, zwłaszcza u pacjentów bez objawów klinicznych. Wyjątkiem jest sytuacja, gdy pacjent ma wyraźne objawy hiperglikemii i bardzo wysoki poziom glukozy we krwi.¹²

Rozpoznanie stanu przedcukrzycowego

Stan przedcukrzycowy (prediabetes) definiuje się jako stan, w którym poziomy glukozy są wyższe niż prawidłowe, ale niewystarczająco wysokie, by rozpoznać cukrzycę. Kryteria diagnostyczne obejmują:¹²

Nieprawidłowa glikemia na czczo (IFG): 100-125 mg/dl (5,6-6,9 mmol/l)
Nieprawidłowa tolerancja glukozy (IGT): 140-199 mg/dl (7,8-11,0 mmol/l) w 2 godzinie OGTT
HbA1c: 5,7-6,4% (39-47 mmol/mol)

Stan przedcukrzycowy wiąże się ze zwiększonym ryzykiem rozwoju cukrzycy i jej powikłań. Wczesne wykrycie tego stanu umożliwia wprowadzenie interwencji zapobiegających lub opóźniających wystąpienie cukrzycy typu 2.¹²

Metody diagnostyczne w cukrzycy

Oznaczanie glikemii na czczo

Oznaczanie glikemii na czczo (FPG – Fasting Plasma Glucose) to podstawowy test diagnostyczny wykonywany po co najmniej 8-godzinnym powstrzymaniu się od spożywania posiłków. Próbkę krwi pobiera się rano, najczęściej po nocnym poście.¹²

Wartości prawidłowe: < 100 mg/dl (5,6 mmol/l)
Stan przedcukrzycowy: 100-125 mg/dl (5,6-6,9 mmol/l)
Cukrzyca: ≥ 126 mg/dl (7,0 mmol/l)

Oznaczanie glikemii na czczo jest powszechnie stosowane ze względu na łatwość wykonania i niższy koszt w porównaniu z innymi testami diagnostycznymi. Badanie to może jednak nie wykryć niektórych przypadków cukrzycy, szczególnie we wczesnych etapach choroby.¹²

Doustny test tolerancji glukozy

Doustny test tolerancji glukozy (OGTT – Oral Glucose Tolerance Test) polega na oznaczeniu stężenia glukozy we krwi na czczo oraz 2 godziny po spożyciu roztworu zawierającego 75 g glukozy. Test ten jest szczególnie przydatny w diagnostyce cukrzycy typu 2 i cukrzycy ciążowej.¹²

Wartości prawidłowe w 2 godzinie testu: < 140 mg/dl (7,8 mmol/l)
Nieprawidłowa tolerancja glukozy: 140-199 mg/dl (7,8-11,0 mmol/l)
Cukrzyca: ≥ 200 mg/dl (11,1 mmol/l)

OGTT uważany jest za złoty standard w diagnostyce cukrzycy, szczególnie w przypadkach, gdy wyniki innych testów są niejednoznaczne. Jest to test bardziej czuły niż oznaczanie glikemii na czczo, jednak wymaga większego nakładu czasu i przygotowania pacjenta.¹²

Oznaczanie hemoglobiny glikowanej

Hemoglobina glikowana (HbA1c) odzwierciedla średnie stężenie glukozy we krwi w ciągu ostatnich 2-3 miesięcy. Jest to test coraz częściej wykorzystywany zarówno w diagnostyce cukrzycy, jak i w monitorowaniu skuteczności jej leczenia.¹²

Wartości prawidłowe: < 5,7% (39 mmol/mol)
Stan przedcukrzycowy: 5,7-6,4% (39-47 mmol/mol)
Cukrzyca: ≥ 6,5% (48 mmol/mol)

Zaletą oznaczania HbA1c jest brak konieczności pozostawania na czczo przed badaniem oraz mniejsza zmienność wyników w porównaniu z pomiarami glikemii. Jednak w niektórych przypadkach, takich jak hemoglobinopatie, niedokrwistości, czy zaburzenia czynności nerek, wyniki HbA1c mogą być niemiarodajne.¹²

Przygodny pomiar glikemii

Przygodny pomiar glikemii (Random Plasma Glucose) to badanie wykonywane o dowolnej porze dnia, niezależnie od czasu ostatniego posiłku. Jest szczególnie przydatne w przypadku pacjentów z klasycznymi objawami cukrzycy, takimi jak wzmożone pragnienie, wielomocz, niezamierzona utrata masy ciała.¹²

Cukrzycę rozpoznaje się, gdy przygodne stężenie glukozy wynosi ≥ 200 mg/dl (11,1 mmol/l) u osoby z typowymi objawami cukrzycy. W przypadku braku objawów, diagnoza musi być potwierdzona innymi testami diagnostycznymi.¹²

Specyfika diagnostyki różnych typów cukrzycy

Diagnostyka cukrzycy typu 1

Cukrzyca typu 1 jest chorobą autoimmunologiczną, w której układ odpornościowy niszczy komórki beta trzustki odpowiedzialne za produkcję insuliny. Diagnostyka cukrzycy typu 1, oprócz standardowych badań glikemii, obejmuje również:¹²

Badanie przeciwciał – wykrywanie autoprzeciwciał skierowanych przeciwko antygenom wysp trzustkowych (ICA), dekarboksylazie kwasu glutaminowego (anty-GAD65), insulinie (IAA), fosfatazie tyrozynowej (IA-2) i transporterowi cynku (ZnT8). Obecność tych przeciwciał potwierdza autoimmunologiczne podłoże choroby.¹²
Badanie stężenia peptydu C – niskie stężenie peptydu C wskazuje na niedobór endogennej insuliny, co jest charakterystyczne dla cukrzycy typu 1.¹
Badanie ciał ketonowych w moczu lub krwi – ich obecność może świadczyć o kwasicy ketonowej, która jest częstym powikłaniem cukrzycy typu 1.¹

Cukrzyca typu 1 często rozwija się gwałtownie, a jej objawy są wyraźne. Diagnostyka powinna być przeprowadzona jak najszybciej, aby zapobiec rozwojowi kwasicy ketonowej, która jest stanem zagrażającym życiu.¹²

Diagnostyka cukrzycy typu 2

Cukrzyca typu 2 charakteryzuje się insulinoopornością i względnym niedoborem insuliny. W przeciwieństwie do cukrzycy typu 1, rozwija się powoli, a objawy mogą być subtelne lub nawet nieobecne przez długi czas. Diagnostyka opiera się głównie na standardowych badaniach glikemii.¹²

Amerykańskie Towarzystwo Diabetologiczne (ADA) zaleca badania przesiewowe w kierunku cukrzycy typu 2 u osób:¹²

W wieku powyżej 35 lat
Z nadwagą lub otyłością (BMI ≥ 25 kg/m² lub ≥ 23 kg/m² u osób pochodzenia azjatyckiego) i co najmniej jednym dodatkowym czynnikiem ryzyka
Z wywiadem rodzinnym cukrzycy, nadciśnieniem tętniczym, dyslipidemią
Z przebytą cukrzycą ciążową
Z zespołem policystycznych jajników

W przypadku prawidłowych wyników badań, powtórne badania przesiewowe zaleca się wykonywać co 3 lata, a u osób z wynikami wskazującymi na stan przedcukrzycowy – co rok.¹²

Diagnostyka cukrzycy ciążowej

Cukrzyca ciążowa (gestational diabetes mellitus, GDM) rozwija się w czasie ciąży u kobiet, które wcześniej nie chorowały na cukrzycę. Diagnostyka cukrzycy ciążowej obejmuje standardowo badania wykonywane między 24. a 28. tygodniem ciąży.¹²

U kobiet z grup wysokiego ryzyka (otyłość, przebyta cukrzyca ciążowa, glikozuria, wywiad rodzinny cukrzycy) badania mogą być wykonane wcześniej, już w pierwszym trymestrze ciąży.¹²

Diagnostykę cukrzycy ciążowej przeprowadza się najczęściej za pomocą dwuetapowej procedury:¹²

Test przesiewowy z 50 g glukozy (test obciążenia glukozą) – nie wymaga bycia na czczo
Doustny test tolerancji glukozy z 75 g glukozy (OGTT) – wykonywany, jeśli test przesiewowy jest nieprawidłowy

Cukrzycę ciążową rozpoznaje się, gdy w OGTT z 75 g glukozy stężenie glukozy po 2 godzinach wynosi ≥ 140 mg/dl (7,8 mmol/l). Niektóre ośrodki stosują niższe progi diagnostyczne.¹

Diagnostyka innych typów cukrzycy

Oprócz najczęstszych typów cukrzycy (typu 1 i 2), istnieją również rzadsze formy, które wymagają specyficznej diagnostyki:¹²

Cukrzyca monogenowa (MODY) – jest spowodowana mutacjami pojedynczych genów. Diagnostyka obejmuje badania genetyczne w kierunku mutacji genów odpowiedzialnych za rozwój tej formy cukrzycy (np. GCK, HNF1A, HNF4A).¹
Cukrzyca związana z mukowiscydozą (CFRD) – rozwija się u pacjentów z mukowiscydozą. Diagnostyka obejmuje standardowe badania glikemii, które powinny być regularnie wykonywane u pacjentów z mukowiscydozą.
Cukrzyca wtórna – rozwijająca się w przebiegu innych chorób (np. przewlekłego zapalenia trzustki, hemochromatozy) lub w wyniku stosowania niektórych leków (np. glikokortykosteroidów). Diagnostyka obejmuje standardowe badania glikemii oraz diagnostykę choroby podstawowej.

Właściwe rozpoznanie typu cukrzycy jest kluczowe dla wyboru odpowiedniego leczenia i zapewnienia pacjentowi optymalnej opieki.¹²

Monitorowanie cukrzycy

Samokontrola glikemii

Samokontrola glikemii jest istotnym elementem opieki diabetologicznej, szczególnie u pacjentów leczonych insuliną. Polega na regularnym pomiarze stężenia glukozy we krwi za pomocą glukometru. Częstotliwość pomiarów zależy od typu cukrzycy, stosowanego leczenia i indywidualnej sytuacji pacjenta.¹²

Wyniki samokontroli glikemii pozwalają na:¹²

Dostosowanie dawek insuliny
Modyfikację diety i aktywności fizycznej
Wczesne wykrywanie hipoglikemii i hiperglikemii
Ocenę skuteczności leczenia

Ważne jest, aby pacjenci zostali odpowiednio przeszkoleni w zakresie prawidłowego wykonywania pomiarów oraz interpretacji wyników.¹

Ciągły monitoring glikemii

Ciągły monitoring glikemii (Continuous Glucose Monitoring, CGM) to zaawansowana metoda kontroli cukrzycy, polegająca na stałym pomiarze stężenia glukozy w płynie śródtkankowym za pomocą specjalnego sensora umieszczonego pod skórą. CGM zapewnia pełny obraz profilu glikemii w ciągu doby, w tym wahania poziomu glukozy, które mogą być przeoczone przy tradycyjnej samokontroli.¹²

Systemy CGM oferują wiele korzyści:¹²

Ciągły pomiar glikemii (nawet co 5 minut)
Alarmy ostrzegające przed hipoglikemią i hiperglikemią
Obrazowanie trendów zmian glikemii
Możliwość integracji z pompami insulinowymi

CGM jest szczególnie zalecany dla pacjentów z cukrzycą typu 1, pacjentów często doświadczających ciężkich hipoglikemii oraz kobiet z cukrzycą w ciąży.¹

Regularne badania kontrolne

Pacjenci z cukrzycą powinni regularnie wykonywać badania kontrolne, które pozwalają na ocenę skuteczności leczenia oraz wczesne wykrycie potencjalnych powikłań. Do najważniejszych badań należą:¹²

Oznaczanie HbA1c – zwykle co 3-6 miesięcy, w zależności od stabilności glikemii i stosowanego leczenia
Badanie funkcji nerek – oznaczanie kreatyninemii, eGFR, albuminurii
Badanie lipidogramu – co najmniej raz w roku
Badanie dna oka – co najmniej raz w roku
Badanie stóp – co najmniej raz w roku
Badanie ciśnienia tętniczego – podczas każdej wizyty lekarskiej

Regularne badania kontrolne pozwalają na utrzymanie dobrej kontroli cukrzycy i zmniejszenie ryzyka powikłań.¹²

Wyzwania diagnostyczne w cukrzycy

Rozróżnianie typów cukrzycy

Właściwe rozróżnienie typu cukrzycy jest kluczowe dla wyboru odpowiedniej metody leczenia. Jednak w praktyce klinicznej może to stanowić wyzwanie, szczególnie w przypadku:¹²

Cukrzycy typu LADA (Latent Autoimmune Diabetes in Adults) – forma cukrzycy autoimmunologicznej rozwijająca się u dorosłych, początkowo często mylona z cukrzycą typu 2
Cukrzycy typu 2 u młodych osób – rosnący problem związany z epidemią otyłości dziecięcej
Cukrzycy monogenowej – rzadkiej formy cukrzycy, która może przypominać zarówno cukrzycę typu 1, jak i typu 2

W przypadkach wątpliwych, pomocne mogą być badania dodatkowe, takie jak oznaczanie autoprzeciwciał, peptydu C czy badania genetyczne.¹²

Specjalne grupy pacjentów

Diagnostyka cukrzycy może być utrudniona w pewnych grupach pacjentów:¹²

Osoby starsze – objawy cukrzycy mogą być niespecyficzne, a wartości HbA1c mogą być wyższe ze względu na fizjologiczne zmiany związane z wiekiem
Kobiety w ciąży – zmiany fizjologiczne w ciąży wpływają na metabolizm glukozy, co wymaga specyficznych kryteriów diagnostycznych
Dzieci i młodzież – rosnąca częstość występowania cukrzycy typu 2 w tej grupie wiekowej utrudnia różnicowanie z cukrzycą typu 1
Pacjenci z chorobami współistniejącymi – choroby wątroby, nerek, niedokrwistości, hemoglobinopatie mogą wpływać na wyniki badań diagnostycznych

W tych przypadkach konieczne jest indywidualne podejście diagnostyczne, uwzględniające specyfikę danej grupy pacjentów.¹²

Nowe metody diagnostyczne

Badania nad nowymi metodami diagnostycznymi w cukrzycy koncentrują się na:¹²

Biomarkerach – identyfikacji nowych markerów biologicznych, które mogłyby wcześniej wykrywać ryzyko rozwoju cukrzycy lub przewidywać jej powikłania
Technikach obrazowania – metodach umożliwiających ocenę masy i funkcji komórek beta trzustki
Technologiach nieinwazyjnych – metodach pomiaru glikemii bez konieczności nakłuwania skóry
Metodach genetycznych – badaniach genomu w celu identyfikacji ryzyka cukrzycy i personalizacji leczenia

Nowe metody diagnostyczne mają potencjał, by umożliwić wcześniejsze wykrywanie cukrzycy, bardziej precyzyjne różnicowanie jej typów oraz lepsze przewidywanie ryzyka powikłań.¹²

Znaczenie wczesnej diagnostyki

Zapobieganie powikłaniom

Wczesna diagnostyka cukrzycy ma kluczowe znaczenie dla zapobiegania powikłaniom, które mogą dotyczyć wielu narządów i układów:¹²

Powikłania mikronaczyniowe – retinopatia, nefropatia, neuropatia
Powikłania makronaczyniowe – choroba niedokrwienna serca, udar mózgu, choroba naczyń obwodowych
Inne powikłania – zakażenia, zespół stopy cukrzycowej, zaburzenia funkcji poznawczych

Badania wykazały, że wczesne rozpoznanie i leczenie cukrzycy znacząco zmniejsza ryzyko rozwoju tych powikłań.¹²

Korzyści ekonomiczne

Wczesna diagnostyka cukrzycy przynosi także wymierne korzyści ekonomiczne:¹

Zmniejszenie kosztów leczenia powikłań cukrzycy, które są znacznie wyższe niż koszty samej diagnostyki i leczenia
Redukcja absencji chorobowej i przedwczesnych rent inwalidzkich
Zwiększenie produktywności pacjentów w wyniku lepszego stanu zdrowia

Szacuje się, że inwestycje w badania przesiewowe i wczesną diagnostykę cukrzycy zwracają się wielokrotnie w postaci oszczędności w systemie opieki zdrowotnej.¹

Jakość życia pacjentów

Wczesna diagnostyka cukrzycy pozwala na:¹²

Skuteczniejsze leczenie i lepszą kontrolę glikemii
Mniejsze ryzyko ostrych powikłań (hipoglikemia, kwasica ketonowa)
Zapobieganie przewlekłym powikłaniom, które znacząco obniżają jakość życia
Wcześniejsze wdrożenie edukacji diabetologicznej, umożliwiającej pacjentowi aktywny udział w leczeniu

Wszystko to przekłada się na lepszą jakość życia pacjentów z cukrzycą i ich bliskich.¹²

Zalecenia dotyczące badań przesiewowych

Grupy wysokiego ryzyka

Badania przesiewowe w kierunku cukrzycy są szczególnie zalecane w następujących grupach wysokiego ryzyka:¹²

Osoby z nadwagą lub otyłością (BMI ≥ 25 kg/m² lub ≥ 23 kg/m² u osób pochodzenia azjatyckiego)
Osoby z dodatnim wywiadem rodzinnym cukrzycy (rodzice, rodzeństwo)
Kobiety z przebytą cukrzycą ciążową lub zespołem policystycznych jajników
Osoby z nadciśnieniem tętniczym (≥ 140/90 mmHg) lub leczone z powodu nadciśnienia
Osoby z dyslipidemią (HDL 250 mg/dl)
Osoby prowadzące siedzący tryb życia
Osoby z chorobami układu sercowo-naczyniowego

W tych grupach ryzyko rozwoju cukrzycy jest znacznie wyższe niż w populacji ogólnej.¹²

Częstotliwość badań przesiewowych

Zalecana częstotliwość badań przesiewowych zależy od wieku, obecności czynników ryzyka oraz wyników poprzednich badań:¹²

Osoby w wieku ≥ 35 lat – badania co 3 lata, niezależnie od obecności czynników ryzyka
Osoby z czynnikami ryzyka – badania co rok, niezależnie od wieku
Osoby ze stanem przedcukrzycowym – badania co rok
Kobiety po przebytej cukrzycy ciążowej – badania co 1-3 lata
Dzieci i młodzież z nadwagą lub otyłością oraz co najmniej dwoma dodatkowymi czynnikami ryzyka – badania co 2 lata, począwszy od 10. roku życia

Indywidualizacja częstotliwości badań przesiewowych w zależności od profilu ryzyka pacjenta jest kluczowa dla efektywnej profilaktyki cukrzycy.¹²

Metody badań przesiewowych

Do badań przesiewowych w kierunku cukrzycy można wykorzystać różne metody diagnostyczne:¹²

Oznaczanie glikemii na czczo (FPG) – najprostsza i najtańsza metoda
Oznaczanie HbA1c – nie wymaga bycia na czczo, daje informację o średnim stężeniu glukozy w ciągu 2-3 miesięcy
Doustny test tolerancji glukozy (OGTT) – najbardziej czuła metoda, szczególnie w wykrywaniu stanów przedcukrzycowych
Kwestionariusze oceny ryzyka – narzędzia przesiewowe, które mogą być wykorzystane do identyfikacji osób wymagających dalszej diagnostyki

Wybór metody badań przesiewowych powinien uwzględniać jej dostępność, koszt, wygodę dla pacjenta oraz czułość i swoistość w wykrywaniu cukrzycy.¹²

Podsumowanie diagnostyki cukrzycy

Diagnostyka cukrzycy obejmuje szereg badań laboratoryjnych mierzących poziom glukozy we krwi lub hemoglobiny glikowanej. Kryteria diagnostyczne opierają się na wartościach progowych związanych z ryzykiem rozwoju mikroangiopatii, szczególnie retinopatii. Właściwa diagnostyka różnych typów cukrzycy jest kluczowa dla wyboru odpowiedniego leczenia i zapewnienia pacjentowi optymalnej opieki. Wczesne wykrywanie cukrzycy i stanów przedcukrzycowych umożliwia wprowadzenie skutecznych interwencji, które mogą zapobiec lub opóźnić rozwój choroby i jej powikłań.¹²

Test diagnostyczny	Wartości prawidłowe	Stan przedcukrzycowy	Cukrzyca
Glikemia na czczo (FPG)	< 100 mg/dl (5.6 mmol/l)	100-125 mg/dl (5.6-6.9 mmol/l)	≥ 126 mg/dl (7.0 mmol/l)
Glikemia w 2h OGTT	< 140 mg/dl (7.8 mmol/l)	140-199 mg/dl (7.8-11.0 mmol/l)	≥ 200 mg/dl (11.1 mmol/l)
Przygodna glikemia	N/A	N/A	≥ 200 mg/dl (11.1 mmol/l) + objawy
HbA1c	< 5.7% (39 mmol/mol)	5.7-6.4% (39-47 mmol/mol)	≥ 6.5% (48 mmol/mol)

Diagnostyka cukrzycy jest procesem dynamicznym, który stale ewoluuje wraz z postępem wiedzy medycznej i technologii. Kluczowe znaczenie ma indywidualne podejście do każdego pacjenta, uwzględniające jego specyficzną sytuację kliniczną, czynniki ryzyka oraz preferencje. Współpraca między pacjentem a zespołem opieki diabetologicznej jest niezbędna dla skutecznej diagnostyki, monitorowania i leczenia cukrzycy.¹²

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Materiały źródłowe

#1 Definition, Classification and Diagnosis of Diabetes, Prediabetes and Metabolic Syndrome – Diabetes Canada
https://www.diabetes.ca/health-care-providers/clinical-practice-guidelines/chapter-3
Diabetes mellitus is a heterogeneous metabolic disorder characterized by the presence of hyperglycemia due to impairment of insulin secretion, defective insulin action or both. The diagnostic criteria for diabetes are based on thresholds of glycemia that are associated with microvascular disease, especially retinopathy. […] The term prediabetes refers to impaired fasting glucose (IFG), impaired glucose tolerance (IGT) or a glycated hemoglobin (A1C) of 6.0% to 6.4%, each of which places individuals at high risk of developing diabetes and its complications. […] The diagnostic criteria for diabetes are summarized in Table 3. These criteria are based on venous samples and laboratory methods. A fasting plasma glucose (FPG) level of 7.0 mmol/L correlates most closely with a 2-hour plasma glucose (2hPG) value of 11.1 mmol/L in a 75 g oral glucose tolerance test (OGTT), and each predicts the development of retinopathy.
#1 Type 2 Diabetes Diagnostic Criteria by the ADA: Type 2 Diabetes ADA Diagnosis Criteria
https://emedicine.medscape.com/article/2172154-overview
Diagnostic criteria by the American Diabetes Association (ADA) include the following: […] A fasting plasma glucose (FPG) level of 126 mg/dL (7.0 mmol/L) or higher, or […] A 2-hour plasma glucose level of 200 mg/dL (11.1 mmol/L) or higher during a 75-g oral glucose tolerance test (OGTT), or […] A random plasma glucose of 200 mg/dL (11.1 mmol/L) or higher in a patient with classic symptoms of hyperglycemia or hyperglycemic crisis, or […] A hemoglobin A1c (HbA1c) level of 6.5% (48 mmol/mol) or higher.
#1 Diabetes Mellitus: Screening and Diagnosis | AAFP
https://www.aafp.org/pubs/afp/issues/2016/0115/p103.html
Results should be confirmed with repeat testing on a subsequent day; however, a single random plasma glucose level of 200 mg per dL or greater with typical signs and symptoms of hyperglycemia likely indicates diabetes. […] Diagnostic testing should be performed in individuals with a clinical history indicative of diabetes. […] The diagnosis of diabetes can be made when classic signs and symptoms of hyperglycemia are associated with a single random plasma glucose measurement of 200 mg per dL (11.1 mmol per L) or greater. […] Alternatively, the diagnosis can be made with an A1C level of 6.5% or greater, a fasting plasma glucose level of 126 mg per dL (7.0 mmol per L) or greater, or a two-hour plasma glucose level of 200 mg per dL or greater during an oral glucose tolerance test with 75-g glucose load. […] However, testing should be repeated on a subsequent day to confirm the diagnosis.
#1 Definition, Classification and Diagnosis of Diabetes, Prediabetes and Metabolic Syndrome – Diabetes Canada
https://www.diabetes.ca/health-care-providers/clinical-practice-guidelines/chapter-3
The term prediabetes refers to IFG, IGT or an A1C of 6.0% to 6.4%, each of which places individuals at high risk of developing diabetes and its complications. Not all individuals with prediabetes will necessarily progress along the continuum of dysglycemia to develop diabetes. […] Prediabetes (defined as a state which places individuals at high risk of developing diabetes and its complications) is diagnosed by any of the following criteria: IFG (FPG 6.1-6.9 mmol/L), IGT (2hPG in a 75 g OGTT 7.8-11.0 mmol/L), A1C 6.0%-6.4%.
#1 What is Prediabetes? | Johns Hopkins | Bloomberg School of Public Health
https://publichealth.jhu.edu/2022/what-is-prediabetes
The CDC estimates that more than one-third of Americans have prediabetes, a condition characterized by mildly elevated glucose levels, also known as hyperglycemia. […] Experts believe it could be due to differing definitions of prediabetes diagnostic criteria and/or the fact that an initial prediabetes diagnosis does not need to be confirmed, while clinical guidelines recommend that an initial diabetes diagnosis be confirmed with a second test. […] Diagnosis is vitally important, however, as prediabetes is often reversible with modest weight loss. […] The American Diabetes Association first introduced the diagnostic criteria for prediabetes (and type 2 diabetes) in 1980 to determine the likelihood of developing bonafide diabetes. […] Screening for prediabetes is an important intervention opportunity, says Selvin.
#1 The diagnosis of type 2 diabetes
https://www.diabinfo.de/en/living-with-diabetes/type-2-diabetes/basic-principles/diagnosis.html
If there are conflicting results or values indicating an increased risk of diabetes, an additional measurement or a 2-hour blood sugar measurement after an oral glucose tolerance test (OGTT) should be performed. […] The fasting blood sugar level in venous plasma is determined in the morning, following a fasting period of at least 8 hours (maximum 12 hours), through a blood draw. […] Normal fasting blood sugar values are considered to be below 100 mg/dl (5.6 mmol/l). Fasting blood sugar values of 126 mg/dl (7.0 mmol/l) or higher are in the diabetic range. […] If the measurement falls between 100 mg/dl (5.6 mmol/l) and 125 mg/dl (6.9 mmol/l), there is an increased risk of diabetes: referred to as „impaired or abnormal fasting glucose” or prediabetes. An oral glucose tolerance test (OGTT) is often performed for clarification.
#1 Type 2 diabetes – Diagnosis and treatment – Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/type-2-diabetes/diagnosis-treatment/drc-20351199
The glycated hemoglobin test most often diagnoses type 2 diabetes. Also called the A1C test, it reflects the average blood sugar level for the past two to three months. Results mean the following: […] If there are no A1C tests or if you have certain conditions that get in the way of A1C test results, your healthcare professional may use the following tests to diagnose diabetes: […] A level of 200 mg/dL (11.1 mmol/L) or higher suggests diabetes. This is most likely if you also have symptoms of diabetes, such as urinating often and being very thirsty. […] 126 mg/dL (7 mmol/L) or higher on two tests is diabetes. […] 200 mg/dL (11.1 mmol/L) or higher after two hours suggests diabetes. […] The American Diabetes Association suggests that all adults age 35 or older have routine tests for type 2 diabetes.
#1 Diabetes Tests & Diagnosis – NIDDK
https://www.niddk.nih.gov/health-information/diabetes/overview/tests-diagnosis
The oral glucose tolerance test (OGTT) helps doctors detect type 2 diabetes, prediabetes, and gestational diabetes. […] Each test to detect diabetes and prediabetes uses a different measurement. Usually, your doctor will use a second test to confirm you have diabetes. […] Even though the tests described above can confirm you have diabetes, they can’t identify what type you haveâtype 1, type 2, or a rare type of diabetes called monogenic diabetes. Treatment can depend on the type of diabetes you have, so knowing which type you have is important. […] Genetic testing can diagnose most forms of monogenic diabetes, which is caused by a changeâor mutationâin a gene. […] If you have diabetes, your doctor may look for certain autoantibodies to see if your diabetes is type 1. Autoantibodies are proteins in your immune system that mistakenly attack your healthy tissues and cells.
#1 What is diabetes | Diabetes Australiachevron
https://www.diabetesaustralia.com.au/about-diabetes/what-is-diabetes/
Non-fasting (or random) blood glucose: this test measures how much glucose is in your bloodstream at a certain type of day if you havenât been fasting or have eaten something recently. It is measured in mmol/L (millimoles per litre). A random (non-fasting) blood glucose of 11.1 mmol/L or more would indicate diabetes. Between 7.8 mmol/L and 11.0 mmol/L is likely pre-diabetes (also called impaired glucose tolerance). […] Oral glucose tolerance test (OGTT): this test combines a fasting and a non-fasting blood glucose test. After the fasting blood test, you will take a very sweet drink and your blood glucose will be tested at 1 hour and 2 hours. The results are in mmol/L (millimoles per litre). Diabetes is likely if your fasting level is 7.0mmol/L or above, or your 2-hour level is 11.1 mmol/L or above.
#1 Symptoms, Diagnosis and Monitoring of Diabetes | American Heart Association
https://www.heart.org/en/health-topics/diabetes/symptoms-diagnosis–monitoring-of-diabetes
Overall, 29.3 million adults in the United States have been diagnosed Type 2 diabetes â and more than 9 million more donât know they have it. […] If you have any of these symptoms, see a health care professional right away for a checkup and proper diagnosis. […] You should be tested for diabetes if you: […] Three tests can help health care professionals diagnose prediabetes and diabetes: […] The A1C test can diagnose prediabetes and diabetes. […] An A1C of 5.7% to 6.4% means that you have prediabetes, and youâre at high risk for developing diabetes. Diabetes is diagnosed when the A1C is 6.5% or higher. […] A blood glucose test measures the amount of glucose (sugar) in your blood. […] Diabetes develops when your body doesnât make enough insulin or develops âinsulin resistanceâ and canât efficiently use the insulin it makes.
#1 Type 1 Diabetes Mellitus Workup: Laboratory Studies, Tests to Differentiate Type 1 from Type 2 Diabetes
https://emedicine.medscape.com/article/117739-workup
ADA guidelines recommend measuring HbA1c at least every 6 months in patients with diabetes who are meeting treatment goals and who have stable glycemic control. […] In a 2009 report, however, an international expert committee appointed by the ADA, the European Association for the Study of Diabetes (EASD), and the International Diabetes Association recommended the HbA1c assay for diagnosing type 1 and type 2 DM. […] Consequently, since 2010 the ADA has included an HbA1c level of 6.5% or higher as a criterion for diabetes diagnosis, with confirmation from repeat testing (unless clinical symptoms are present and the glucose level exceeds 200 mg/dL). […] Screening for type 1 DM in asymptomatic low-risk individuals is not recommended. […] However, in patients at high risk (eg, those who have first-degree relatives with type 1 DM), it may be appropriate to perform annual screening for anti-islet antibodies before the age 10 years, along with 1 additional screening during adolescence.
#1 Diabetes Diagnosis: Tests and Guidelines
https://www.webmd.com/diabetes/diagnosis-diabetes
The following tests are used to diagnose diabetes: A fasting plasma glucose test measures your blood glucose after you have gone at least 8 hours without eating. This test is used to detect diabetes or prediabetes. […] An oral glucose tolerance test measures your blood sugar after you have gone at least 8 hours without eating and 2 hours after you drink a glucose-containing beverage. This test can be used to diagnose diabetes or prediabetes. […] In a random plasma glucose test, your doctor checks your blood sugar without regard to when you ate your last meal. This test, along with an assessment of symptoms, is used to diagnose diabetes but not prediabetes. […] A hemoglobin A1c (HbA1c) test can be done without fasting and can be used to diagnose or confirm either prediabetes or diabetes.
#1 Diabetes – Diagnosis and treatment – Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/diabetes/diagnosis-treatment/drc-20371451
Type 1 diabetes symptoms often start suddenly and are often the reason for checking blood sugar levels. […] The American Diabetes Association (ADA) has developed screening guidelines. The ADA recommends that the following people be screened for diabetes: […] Anyone older than age 35 is advised to get an initial blood sugar screening. If the results are normal, they should be screened every three years after that. […] Testing using a glucose meter is not enough because glucose measurements in people with type one diabetes vary from normal to low and normal to high very rapidly in the course of a day, a continuous glucose monitor is needed to assess whether treatment is effective and also to determine how to improve treatment. […] Current guidelines recommend use of a continuous glucose monitor.
#1 Type 1 Diabetes: Causes, Symptoms, Complications & Treatment
https://my.clevelandclinic.org/health/diseases/21500-type-1-diabetes
Type 1 diabetes is a chronic (life-long) autoimmune disease that prevents your pancreas from making insulin. It requires daily management with insulin injections and blood sugar monitoring. Both children and adults can be diagnosed with Type 1 diabetes. […] If you or your child has these symptoms, its essential to see your healthcare provider and ask to be tested for Type 1 diabetes as soon as possible. The sooner youre diagnosed, the better. […] Type 1 diabetes is relatively simple to diagnose. If you or your child has symptoms of Type 1 diabetes, your healthcare provider will order the following tests: […] Your healthcare provider uses a blood glucose test to check the amount of sugar in your blood. They may ask you to do a random test (without fasting) and a fasting test (no food or drink for at least eight hours before the test). If the result shows that you have very high blood sugar, it typically means you have Type 1 diabetes.
#1 Understanding a Type 1 Diabetes Diagnosis – Breakthrough T1D
https://www.breakthrought1d.org/t1d-basics/diagnosis/
Diagnosing type 1 diabetes […] A type 1 diabetes (T1D) diagnosis often happens suddenly or unexpectedly. Many times, the symptoms mimic those of another illness. When you visit your doctor, be sure to provide a thorough list of the symptoms you or your child is experiencing. […] If a person is displaying common symptoms of type 1 diabetes, the following tests are usually done: […] The quickest option to identify high blood sugar, which is associated with T1D, is a random glucose test. This test simply measures a patientâs current blood sugar. This is often the first test done to diagnose T1D. […] The hemoglobin A1c test shows the average blood-sugar level for the past two to three months. […] Elevated ketones in the urine or blood indicate the body is not making enough insulin and is breaking down fat for energy.
#1 Stages and diagnosis of T1D | Breakthrough T1D
https://breakthrought1d.ca/stages-and-diagnosis-of-t1d/
Random blood-glucose test The quickest option for testing for T1D is a random glucose test. […] Glycated hemoglobin (HbA1c) test The most comprehensive test is the hemoglobin A1c test. […] C-Peptide This test measures how much C-peptide is in a personâs blood. […] Autoantibodies […] These are the same autoantibodies that are tested for T1D risk screening. […] After beginning insulin therapy at diagnosis, many people with T1D enter a âhoneymoon phaseâ. […] Eventually, the majority of the insulin-producing beta cells in the pancreas cease functioning and the diabetes symptoms return. […] Screening for early-stage T1D and understanding how the autoimmune process attacks beta cells provide an opportunity to create therapies to delay, or maybe even prevent, the progression of type 1 diabetes. […] Teplizumab (brand name Tzield) was approved by the FDA in 2022 for use in stage 2 T1D to delay the progression to diagnosis. […] Ultimately, the hope is that T1D screening will be a pathway to a cure, catching the disease and treating it before it can start.
#1 Type 1 Diabetes | Boston Children’s Hospital
https://www.childrenshospital.org/conditions/type-1-diabetes
Type 1 diabetes is an autoimmune disease. The bodyâs immune system does not recognize the cells in the pancreas that make insulin (beta cells) and attacks and destroys these cells. As a result, the body is unable to produce enough insulin, a hormone that regulates the amount of sugar in the blood. […] To confirm a diagnosis, your childâs doctor may order some or all of the following blood and urine tests: Hemoglobin A1C test: a blood test that indicates your childâs average blood sugar level for the past two to three months, Random blood sugar test: a blood sample taken at a random time, Fasting blood sugar test: a blood sample taken after an overnight fast, To help distinguish between type 1 and type 2 diabetes, your childâs doctor may also check for autoantibodies in the blood that are common in type 1 diabetes, Ketones test: a test that measures ketones, byproducts from the breakdown of fat in children without enough insulin in the urine or blood.
#1 Diabetes Mellitus: Screening and Diagnosis | AAFP
https://www.aafp.org/pubs/afp/issues/2016/0115/p103.html
Diabetes mellitus is one of the most common diagnoses made by family physicians. […] Screening patients before signs and symptoms develop leads to earlier diagnosis and treatment, but may not reduce rates of end-organ damage. […] The U.S. Preventive Services Task Force recommends screening for abnormal blood glucose and type 2 diabetes in adults 40 to 70 years of age who are overweight or obese, and repeating testing every three years if results are normal. […] The American Diabetes Association recommends screening for type 2 diabetes annually in patients 45 years and older, or in patients younger than 45 years with major risk factors. […] The diagnosis can be made with a fasting plasma glucose level of 126 mg per dL or greater; an A1C level of 6.5% or greater; a random plasma glucose level of 200 mg per dL or greater; or a 75-g two-hour oral glucose tolerance test with a plasma glucose level of 200 mg per dL or greater.
#1 Diabetes Testing | Diabetes | CDC
https://www.cdc.gov/diabetes/diabetes-testing/index.html
If your doctor thinks you have type 1 diabetes, your blood may also be tested for autoantibodies. […] You may have your urine tested for ketones. […] Gestational diabetes usually develops around the 24th week of pregnancy. You’ll probably be tested between 24 and 28 weeks. […] If you’re at higher risk for gestational diabetes, your doctor may test you earlier. […] The A1C test measures your average blood sugar level over the past 2 or 3 months. […] This measures your blood sugar after an overnight fast (not eating). […] This measures your blood sugar before and after you drink a liquid that contains glucose. […] This measures your blood sugar at the time you’re tested. […] If your results show you have type 1, type 2, or gestational diabetes, talk with your doctor about a detailed treatment plan.
#1 Diabetes Testing | National Jewish Health
https://www.nationaljewish.org/conditions/diabetes/diagnosis
A diagnosis of diabetes can be made based on any of the following test results: […] Hemoglobin A1C. An A1C of equal to or greater than 6.5%. […] Fasting blood glucose test. A blood glucose level of 126 milligrams per deciliter (mg/dL) or more after an 8-hour fast. […] A random (taken at any time of day) blood glucose level of 200 mg/dL or more, along with the presence of diabetes symptoms, on 2 or more occasions. […] Oral glucose tolerance test. A blood glucose level of 200 mg/dL or more, 2 hours after drinking a beverage containing 75 grams of glucose dissolved in water. […] Gestational diabetes is diagnosed based on blood glucose levels measured during the oral glucose tolerance test, though the cutoffs for diagnosis are lower because glucose levels are normally lower during pregnancy.
#1 MODY Diabetes: Causes, Symptoms, Diagnosis and Treatment | Nationwide Children’s Hospital
https://www.nationwidechildrens.org/conditions/diabetes-mody
MODY is the name given to a collection of different types of inherited forms of diabetes that usually develop in adolescence or early adulthood. […] MODY is a monogenic disease. This means it is caused by a single gene mutation. […] A blood sugar test is the first step toward diagnosing MODY. If your results indicate you have diabetes, your doctor may order additional tests to determine if you have MODY or another type of diabetes, such as type 1 or 2. […] Since MODY is caused by a genetic mutation, a genetic test can also help diagnose it. This testing will determine the exact type of MODY. […] MODY is caused by a genetic mutation passed on through the family. Theres currently no way to prevent or cure it, but it can be managed, and predicted. Knowledge is power. […] MODY is often treated with oral medications or insulin injections, and some forms may not require any treatment. The specific treatment may vary depending on what genetic mutation caused the condition.
#1 Type 1 Diabetes: Causes, Symptoms, Complications & Treatment
https://my.clevelandclinic.org/health/diseases/21500-type-1-diabetes
Checking your blood sugar with a glucometer and/or using a continuous glucose monitor (CGM) is crucial to managing diabetes and preventing complications. […] A large part of Type 1 diabetes management is counting carbohydrates (carbs) in the food and drinks you consume in order to give yourself proper doses of insulin. […] If you or your child are experiencing symptoms of Type 1 diabetes, such as extreme thirst and frequent urination, see your healthcare provider as soon as possible.
#1 Diabetes Mellitus (DM) – Endocrine and Metabolic Disorders – Merck Manual Professional Edition
https://www.merckmanuals.com/professional/endocrine-and-metabolic-disorders/diabetes-mellitus-and-disorders-of-carbohydrate-metabolism/diabetes-mellitus-dm
HbA1C measurements are now included in the diagnostic criteria for diabetes: HbA1C 6.5% = diabetes. […] Diabetes mellitus control can be monitored by measuring blood levels of glucose, HbA1C, and fructosamine. […] The goal of diabetes treatment is control of hyperglycemia to relieve symptoms and prevent complications while minimizing hypoglycemic episodes. […] The disease generally develops in adults and becomes more common with increasing age; up to one third of adults age 65 years have impaired glucose tolerance. […] Patients with type 1 diabetes typically present with symptomatic hyperglycemia and sometimes with diabetic ketoacidosis (DKA). […] Diagnosis is by measuring plasma glucose. […] HbA1C levels reflect glucose control over the preceding 3 months and hence assess control between physician visits.
#1 Coping With a Type 2 Diabetes Diagnosis | Diabetes | CDC
https://www.cdc.gov/diabetes/signs-symptoms/coping-with-type-2-diagnosis.html
With DSMES, you can gain the knowledge, skills, and support needed to successfully manage diabetes. […] A diabetes care and education specialist will be an important part of your health care team. […] Your plan will be specific to your health needs, lifestyle, beliefs, and culture. […] DSMES has been proven to help improve A1C, blood pressure, and cholesterol levels. […] Eating healthy foods lower in carbohydrates, added sugars, saturated fat, and sodium (salt) will be key to managing your blood sugar. […] One of the best ways to manage diabetes is to get regular physical activity. […] Regular physical activity has many other health benefits as well, like better sleep, weight loss, and less stress. […] You’re not alone, so don’t go it aloneconnect with others living with type 2 diabetes. […] Your diabetes diagnosis may come with big life changes. […] With the right diabetes management plan, you’ll be able to live your best life while successfully managing your diabetes. […] Diabetes is a chronic disease that affects how your body turns food into energy.
#1 Diabetes – Diagnosis and treatment – Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/diabetes/diagnosis-treatment/drc-20371451
Many types of insulin are available, including short-acting (regular insulin), rapid-acting insulin, long-acting insulin and intermediate options. […] Continuous glucose monitor and insulin pump […] A continuous glucose monitor, on the left, is a device that measures your blood sugar every few minutes using a sensor inserted under the skin. […] Insulin pumps are programmed to deliver specific amounts of insulin automatically and when you eat.
#1 Diabetes Mellitus (DM) – Endocrine and Metabolic Disorders – Merck Manual Professional Edition
https://www.merckmanuals.com/professional/endocrine-and-metabolic-disorders/diabetes-mellitus-and-disorders-of-carbohydrate-metabolism/diabetes-mellitus-dm
HbA1C should be assessed quarterly in patients with type 1 diabetes and at least twice a year in patients with type 2 diabetes when plasma glucose appears stable and more frequently when control is uncertain. […] HbA1C levels measured in venous plasma are monitored every 3 months or, for patients with consistently good control, every 6 months. […] Continuous glucose monitoring (CGM) systems estimate capillary blood glucose from interstitial glucose detected by a subcutaneous sensor. […] Use of CGMs has been shown to increase patients’ time in target range (TIR) and decrease HbA1C.
#1 Laboratory Testing for Diabetes Diagnosis and Management | Test Guide | Quest Diagnostics Hereditary Cancer Test Selection GuideHereditary Cancer Test Selection Guide
https://testdirectory.questdiagnostics.com/test/test-guides/TG_Diabetes/laboratory-testing-for-diabetes-diagnosis-and-management
Alternatives to HbA1c testing for monitoring glycemic control over the intermediate term include fructosamine testing (2 to 3 weeks) and 1,5-anhydroglucitol (1,5-AG, 1 to 2 weeks) testing. […] Individuals with diabetes are at increased risk of heart and kidney disease, retinopathy, neuropathy, and nonalcoholic fatty liver disease (NAFLD). […] Routine eye and foot exams, along with blood pressure, lipids, urine albumin-creatinine ratio, creatinine/estimated glomerular filtration rate (eGFR), and liver function testing, are recommended to detect the onset and monitor progression of these complications.
#1 Type 1 and Type 2 Diabetes – The Johns Hopkins Patient Guide to Diabetes
https://hopkinsdiabetesinfo.org/diagnosis-of-diabetes/
There are important differences between type 1 diabetes (~5% of persons) and type 2 diabetes (90-95% of persons). Diagnosing the type of diabetes is important for appropriate medical treatment. […] The same diagnostic criteria are used for both types of diabetes. However, blood tests (i.e. autoantibody tests) may help clarify whether a patient has type 1 versus type 2 diabetes.
#1 Criteria for Diagnosing Diabetes | Kaiser Permanente
https://healthy.kaiserpermanente.org/health-wellness/health-encyclopedia/he.criteria-for-diagnosing-diabetes.tj4293
Doctors use blood tests and follow guidelines from experts to diagnose diabetes. You will be diagnosed with diabetes if you meet one of the following criteria: You have symptoms of diabetes and a blood sugar level equal to or greater than 200 mg/dL. Your fasting blood sugar level is equal to or greater than 126 mg/dL. Your 2-hour oral glucose tolerance test result is equal to or greater than 200 mg/dL. Your hemoglobin A1c result is 6.5% or higher. […] Two tests are used to confirm the diagnosis of diabetes. […] It may be hard to tell what type of diabetes you have. If so, your doctor may do a C-peptide test or test for autoantibodies to diagnose type 1 diabetes or a slowly developing form of type 1 diabetes called latent autoimmune diabetes in adults (LADA).
#1 Diagnosis of diabetes mellitus â GPnotebook
https://gpnotebook.com/pages/diabetes-and-endocrinology/diagnosis-of-diabetes-mellitus
Situations where HbA1c is not appropriate for diagnosis of diabetes include ALL children and young people, patients of any age suspected of having Type 1 diabetes, patients with symptoms of diabetes for less than 2 months, patients at high diabetes risk who are acutely ill, and patients taking medication that may cause rapid glucose rise.
#1 Global variation in diabetes diagnosis and prevalence based on fasting glucose and hemoglobin A1c | Nature Medicine
https://www.nature.com/articles/s41591-023-02610-2
Fasting plasma glucose (FPG) and hemoglobin A1c (HbA1c) are both used to diagnose diabetes, but these measurements can identify different people as having diabetes. […] The age-standardized proportion of diabetes that was previously undiagnosed and detected in survey screening ranged from 30% in the high-income western region to 66% in south Asia. […] In most low- and middle-income regions, isolated elevated HbA1c was more common than isolated elevated FPG. […] The use of FPG alone may delay diabetes diagnosis and underestimate diabetes prevalence. […] Our prediction equations help allocate finite resources for measuring HbA1c to reduce the global shortfall in diabetes diagnosis and surveillance. […] The diagnostic criteria for diabetes have evolved over time to incorporate hemoglobin A1c (HbA1c), which is a measure of long-term glycemic status and more convenient to measure for patients than fasting glucose or the 2-h oral glucose tolerance test (OGTT).
#1 Global variation in diabetes diagnosis and prevalence based on fasting glucose and hemoglobin A1c | Nature Medicine
https://www.nature.com/articles/s41591-023-02610-2
The lack of data on the regional variation in diabetes identified based on FPG versus HbA1c means that we cannot quantify the full extent of the global diabetes epidemic and its regional variation. […] We also quantified, among those who were previously undiagnosed and were detected as having diabetes through screening in the survey, the concordance and discordance of having FPG and HbA1c above common diagnostic thresholds (7.0mmoll1 for FPG and 6.5% for HbA1c). […] It has been shown that having elevated levels of both biomarkers has high positive predictive value for subsequent clinical diagnosis and risk of complications. […] Finally, we leveraged the global coverage of the dataset and its large sample size to develop prediction equations that estimate, for any given FPG level, the probability that a person without previously diagnosed diabetes would have HbA1c above the clinical threshold for diabetes had it been measured, and vice versa.
#1
https://www.who.int/news-room/fact-sheets/detail/diabetes
Diabetes can be treated and its consequences avoided or delayed with diet, physical activity, medication and regular screening and treatment for complications. […] Early diagnosis can be accomplished through relatively inexpensive testing of blood glucose. […] Gestational diabetes is diagnosed through prenatal screening, rather than through reported symptoms. […] The best way to detect diabetes early is to get regular check-ups and blood tests with a healthcare provider. […] WHO develops norms and standards for diabetes diagnosis and care.
#1 Diabetes Testing | Diabetes | CDC
https://www.cdc.gov/diabetes/diabetes-testing/index.html
You’ll need a blood sugar test to find out if you have prediabetes or diabetes. […] Testing is simple, and results are usually available quickly. […] That’s why people with any risk factors are urged to ask their doctor if they should be screened. Being screened means getting tested when you don’t have any symptoms. […] Catching prediabetes early can help people prevent or delay type 2 diabetes. Finding out they have type 2 diabetes and taking action can help people prevent or delay serious health complications. […] Getting tested is simple and quick. Your blood will be drawn at your doctor’s office or at a clinic so your blood sugar can be tested. Results are usually available quickly. […] Ask your doctor about getting tested for prediabetes or type 2 diabetes if you have any of the risk factors.
#1 Diabetes Mellitus: What a Diagnosis Means for Your Health â ProVention Health Foundation
https://www.proventionhealth.org/diabetes-mellitus-what-a-diagnosis-means-for-your-health/
Diabetes mellitus is a medical condition in which insulin and blood glucose (sugar) function is abnormal. […] This article will provide an overview of treating type 1 and type 2 diabetes. […] Itâs crucial to get diagnosed with diabetes as soon as possible. Untreated diabetes causes health complications that impact your heart, kidneys, skin, and eyes. […] By the time people with undiagnosed diabetes are diagnosed, they already have damage to their blood vessels. […] Most people with type 2 diabetes have a four- to seven-year delay in a clinical diagnosis. […] If you have health insurance, make sure you get your blood sugar checked regularly. […] A diabetes treatment plan will always include lifestyle changes such as regular exercise and eating healthy foods. […] Once you are diagnosed, your healthcare provider will help create a plan to manage your diabetes to prevent further damage to your body.
#1 Coping With a Type 2 Diabetes Diagnosis | Diabetes | CDC
https://www.cdc.gov/diabetes/signs-symptoms/coping-with-type-2-diagnosis.html
Being diagnosed with diabetes is a big life change. […] While there’s no cure for type 2 diabetes, there are ways to manage it and thrive. […] Your doctor, diabetes education specialist, and other health care professionals can help you create a plan for your specific needs. […] A successful diabetes management plan will include healthy eating, exercise, medical support, and emotional support. […] You’ve been diagnosed with type 2 diabetes because your body doesn’t use insulin well. […] Because of that, it can’t keep your blood sugar at normal levels. […] Now that you know you have diabetes, you can plan your next steps to help manage it and prevent serious complications. […] People with diabetes are living longer, healthier lives than ever before with fewer complications. […] And help is available through diabetes self-management education and support (DSMES) services.
#1 Recommendation: Prediabetes and Type 2 Diabetes: Screening | United States Preventive Services Taskforce
https://www.uspreventiveservicestaskforce.org/uspstf/recommendation/screening-for-prediabetes-and-type-2-diabetes
The diagnosis of type 2 diabetes should be confirmed with repeat testing. […] The optimal screening interval for adults with an initial normal glucose test result is uncertain. Screening every 3 years may be a reasonable approach for adults with normal blood glucose levels. […] Both lifestyle interventions that focus on diet, physical activity, or both and metformin have demonstrated efficacy in preventing or delaying progression to diabetes in persons with prediabetes. […] The American Diabetes Association recommends universal screening for prediabetes and diabetes, using a fasting plasma glucose level, 2-hour plasma glucose level during a 75-g oral glucose tolerance test, or HbA1c level, for all adults 45 years or older, regardless of risk factors, and screening adults who have overweight or obesity (BMI 25 or 23 in Asian American persons) with 1 or more risk factors, regardless of age. […] If the results are normal, it recommends repeat screening at a minimum of 3-year intervals.
#1 Laboratory Testing for Diabetes Diagnosis and Management | Test Guide | Quest Diagnostics Hereditary Cancer Test Selection GuideHereditary Cancer Test Selection Guide
https://testdirectory.questdiagnostics.com/test/test-guides/TG_Diabetes/laboratory-testing-for-diabetes-diagnosis-and-management
This test guide discusses the use and interpretation of laboratory tests for diagnosing diabetes and monitoring glycemic control. […] This Test Guide discusses the use of laboratory tests for diagnosing diabetes mellitus, monitoring glycemic control in individuals with diabetes, and monitoring diabetic complications. […] Tools for diagnosing diabetes mellitus include fasting plasma glucose (FPG) measurement, oral glucose tolerance tests (OGTT), and standardized hemoglobin A1c (HbA1c) assays. […] Generally, all 3 tests are equally appropriate for diagnostic screening, although one may be more appropriate than another depending on an individualâs characteristics (eg, due to nondiabetic illness or stage of pregnancy). […] The American Diabetes AssociationÂ® (ADA) recommends using FPG, OGTT, and HbA1c for diagnosing diabetes and identifying increased diabetes risk (prediabetes).
#2 Diabetes Mellitus: Diagnosis and Screening | AAFP
https://www.aafp.org/pubs/afp/issues/2010/0401/p863.html
Based on etiology, diabetes is classified as type 1 diabetes mellitus, type 2 diabetes mellitus, latent autoimmune diabetes, maturity-onset diabetes of youth, and miscellaneous causes. The diagnosis is based on measurement of A1C level, fasting or random blood glucose level, or oral glucose tolerance testing. […] Prevention, timely diagnosis, and treatment are important in patients with diabetes mellitus. Many of the complications associated with diabetes, such as nephropathy, retinopathy, neuropathy, cardiovascular disease, stroke, and death, can be delayed or prevented with appropriate treatment of elevated blood pressure, lipids, and blood glucose. […] In 1997, the American Diabetes Association (ADA) introduced an etiologically based classification system and diagnostic criteria for diabetes, which were updated in 2010. Type 2 diabetes accounts for approximately 90 to 95 percent of all persons with diabetes in the United States, and its prevalence is increasing in adults worldwide.
#2 Diabetes – Wikipedia
https://en.wikipedia.org/wiki/Diabetes
Diabetes is diagnosed with a test for the glucose content in the blood, and is diagnosed by demonstrating any one of the following: Fasting plasma glucose level 7.0 mmol/L (126 mg/dL). For this test, blood is taken after a period of fasting, i.e. in the morning before breakfast, after the patient had sufficient time to fast overnight or at least 8 hours before the test. […] Plasma glucose 11.1 mmol/L (200 mg/dL) two hours after a 75 gram oral glucose load as in a glucose tolerance test (OGTT) […] Symptoms of high blood sugar and plasma glucose 11.1 mmol/L (200 mg/dL) either while fasting or not fasting […] Glycated hemoglobin (HbA1C) 48 mmol/mol (6.5 DCCT %). […] A positive result, in the absence of unequivocal high blood sugar, should be confirmed by a repeat of any of the above methods on a different day. It is preferable to measure a fasting glucose level because of the ease of measurement and the considerable time commitment of formal glucose tolerance testing, which takes two hours to complete and offers no prognostic advantage over the fasting test. […] According to the current definition, two fasting glucose measurements at or above 7.0 mmol/L (126 mg/dL) is considered diagnostic for diabetes mellitus.
#2 Diagnosis of diabetes mellitus â GPnotebook
https://gpnotebook.com/pages/diabetes-and-endocrinology/diagnosis-of-diabetes-mellitus
Diabetes is diagnosed on the basis of history (ie polyuria, polydipsia and unexplained weight loss) PLUS a random venous plasma glucose concentration = 11.1 mmol/l OR a fasting plasma glucose concentration = 7.0 mmol/l (whole blood = 6.1 mmol/l) OR 2 hour plasma glucose concentration = 11.1 mmol/l 2 hours after 75g anhydrous glucose in an oral glucose tolerance test (OGTT). […] With no symptoms diagnosis should not be based on a single glucose determination but requires confirmatory plasma venous determination. At least one additional glucose test result on another day with a value in the diabetic range is essential, either fasting, from a random sample or from the two hour post glucose load. […] It should be noted that children usually present with severe symptoms and diagnosis should then be based on a single raised blood glucose result, as above. Immediate referral to a Paediatric Diabetes Team should not be delayed.
#2 Diabetes Mellitus: Diagnosis and Screening | AAFP
https://www.aafp.org/pubs/afp/issues/2010/0401/p863.html
In 2003, the ADA lowered the threshold for diagnosis of impaired fasting glucose to include a fasting glucose level between 100 and 125 mg per dL (5.6 and 6.9 mmol per L). […] A1C measurement has recently been endorsed by the ADA as a diagnostic and screening tool for diabetes. One advantage of using A1C measurement is the ease of testing because it does not require fasting. An A1C level of greater than 6.5 percent on two separate occasions is considered diagnostic of diabetes. […] Tests that can be used to establish the etiology of diabetes include those reflective of beta cell function (e.g., C peptide) and markers of immune-mediated beta cell destruction (e.g., insulin, islet cell, glutamic acid decarboxylase, IA-2 and IA-2 autoantibodies).
#2 Recommendation: Prediabetes and Type 2 Diabetes: Screening | United States Preventive Services Taskforce
https://www.uspreventiveservicestaskforce.org/uspstf/recommendation/screening-for-prediabetes-and-type-2-diabetes
The diagnosis of type 2 diabetes should be confirmed with repeat testing. […] The optimal screening interval for adults with an initial normal glucose test result is uncertain. Screening every 3 years may be a reasonable approach for adults with normal blood glucose levels. […] Both lifestyle interventions that focus on diet, physical activity, or both and metformin have demonstrated efficacy in preventing or delaying progression to diabetes in persons with prediabetes. […] The American Diabetes Association recommends universal screening for prediabetes and diabetes, using a fasting plasma glucose level, 2-hour plasma glucose level during a 75-g oral glucose tolerance test, or HbA1c level, for all adults 45 years or older, regardless of risk factors, and screening adults who have overweight or obesity (BMI 25 or 23 in Asian American persons) with 1 or more risk factors, regardless of age. […] If the results are normal, it recommends repeat screening at a minimum of 3-year intervals.
#2 Diabetes Tests & Diagnosis – NIDDK
https://www.niddk.nih.gov/health-information/diabetes/overview/tests-diagnosis
Experts recommend routine testing for type 2 diabetes if you have certain risk factors. […] If your blood glucose levels are higher than the target range, but not high enough to be diagnosed with diabetes, doctors will diagnose you with prediabetes. […] All women who are planning to get pregnant should be tested for type 2 diabetes, especially if they have risk factors. […] Doctors use a variety of tests to diagnose diabetes and prediabetes. […] The fasting plasma glucose (FPG) test measures your blood glucose level at a single point in time. […] The A1C test is a blood test that provides your average levels of blood glucose over the last 3 months. […] Sometimes doctors use the random plasma glucose test to diagnose diabetes when you have symptoms of diabetes and they do not want to wait until you have fasted for 8 hours.
#2 Blood Glucose Test (Blood Sugar) and HbA1c
https://patient.info/diabetes/diabetes-mellitus-leaflet/tests-for-blood-sugar-glucose-and-hba1c
Blood glucose (sugar) tests check the amount of glucose in the blood. These tests help diagnose diabetes, including type 1 and type 2 diabetes mellitus. They are also used to monitor glucose control in people already living with diabetes. […] A blood sample taken at any time can be a useful test if diabetes is suspected. A level of 11.1 mmol/L or more in the blood sample indicates diabetes. A fasting blood glucose test may be done to confirm the diagnosis. […] A glucose level below 11.1 mmol/L on a random blood sample does not rule out diabetes. A blood test taken in the morning before you eat anything is a more accurate test. […] A level of 7.0 mmol/L or more indicates that you have diabetes. […] If you have no symptoms of diabetes but the blood test shows a glucose level of 7.0 mmol/L or more, the blood sugar test should be repeated to confirm you have diabetes.
#2 The diagnosis of type 2 diabetes
https://www.diabinfo.de/en/living-with-diabetes/type-2-diabetes/basic-principles/diagnosis.html
HbA1c, also known as long-term blood sugar, describes the average blood sugar content over the last 8 to 12 weeks. […] HbA1c can be determined through a blood sample, and fasting is not required for this measurement. […] The following threshold ranges apply to the HbA1c value: under 5.7 percent (39 mmol/mol): no diabetes; 6.5 percent (48 mmol/mol) or greater: diabetes. […] If the HbA1c value falls between these thresholds, there is an increased risk of diabetes. Further measurement of fasting blood sugar and/or 2-hour blood sugar in the oral glucose tolerance test (OGTT) is required for clarification. […] The oral glucose tolerance test (OGTT) is used to monitor blood sugar levels and is performed when there is suspicion of type 2 diabetes. […] A normal glucose tolerance is defined by a fasting blood sugar value (time point 0) below 100 mg/dl (5.6 mmol/l) and an OGTT 2-hour blood sugar value below 140 mg/dl (7.8 mmol/l) both measured in venous plasma.
#2 Diagnosis – Diabetes Victoriaphone-solidsearchShapephone-solidsearchShapedropdownsearchChevronChevronChevronChevronChevronIncrease TextDecrease TextGrayscaleHigh ContrastNegative ContrastLight BackgroundLinks UnderlineReadable FontResetSitemapHelpFeedback
https://www.diabetesvic.org.au/about-diabetes/diagnosis/
A diagnosis of diabetes should not be made only by using a blood glucose meter and finger prick, or by urine glucose test. Although, your doctor may take a blood test with a finger prick in the consulting room, you will still need a further blood test sent to pathology to confirm the diagnosis. […] As an adult, it can sometimes be difficult to distinguish between type 1 diabetes and type 2 diabetes. Your doctor will have to go on the history and severity of the symptoms, then confirm with further blood tests if type 1 diabetes is suspected. […] Some people will have a fasting blood level that is above the normal range, but not high enough to be diabetes. For example, a fasting blood glucose level that is between 5.5mmol/L and 6.9mmol/L is above the normal range but does not confirm or rule out diabetes or pre-diabetes. In this situation your doctor should order an oral glucose tolerance test (OGTT). […] An OGTT involves a blood test taken from a vein, usually the arm, at a pathology lab.
#2 Diagnostic criteria for diabetes | Diabetes UK
https://www.diabetes.org.uk/for-professionals/improving-care/clinical-recommendations-for-professionals/diagnosis-ongoing-management-monitoring/new_diagnostic_criteria_for_diabetes
Diabetes UK supports the diagnostic criteria published by the WHO in 2006: „definition and diagnosis of diabetes mellitus and intermediate hyperglycaemia”. Diabetes UK also welcomes the 2011 decision by the WHO to accept the use of HbA1c testing in diagnosing diabetes: „use of glycated haemoglobin in the diagnosis of diabetes mellitus”. […] Information on the diagnostic criteria for diabetes is below. For further information and an explanation of terms and classifications please refer to the full WHO guidelines. […] An HbA1c of 48mmol/mol (6.5%) is recommended as the cut off point for diagnosing diabetes. A value of less than 48mmol/mol (6.5%) does not exclude diabetes diagnosed using glucose tests. […] In patients without symptoms of diabetes the laboratory venous HbA1c should be repeated. If the second sample is 48mmol/mol (6.5%) the person should be treated as at high risk of diabetes and the test should be repeated in 6 months or sooner if symptoms develop. […] These patients may still fulfill WHO glucose criteria for the diagnosis of diabetes.
#2 Diabetes test: How to test for diabetes | Diabetes UK
https://www.diabetes.org.uk/about-diabetes/test-for-diabetes
A simple test developed by researchers called C-peptide can help identify if someone has type 1 or type 2 diabetes. […] An HbA1c test is the main blood test used to diagnose diabetes. It tests your average blood sugar levels for the last two to three months. […] You have diabetes if your HbA1c level is 48mmol/mol or above. You are at risk of developing type 2 diabetes (often known as prediabetes) if your HbA1c is between 42 and 48mmol/mol. […] Youll be diagnosed with diabetes if your blood glucose levels are 7mmol/l or more. […] A urine test for glucose on its own cant diagnose diabetes. It will show your doctor if there is any sugar in your urine, not how much or the possible cause. […] Home testing kits bought over the counter cant diagnose diabetes. Neither can testing equipment used by people with diabetes, like blood glucose meters.
#2 Type 2 diabetes – Diagnosis and treatment – Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/type-2-diabetes/diagnosis-treatment/drc-20351199
The glycated hemoglobin test most often diagnoses type 2 diabetes. Also called the A1C test, it reflects the average blood sugar level for the past two to three months. Results mean the following: […] If there are no A1C tests or if you have certain conditions that get in the way of A1C test results, your healthcare professional may use the following tests to diagnose diabetes: […] A level of 200 mg/dL (11.1 mmol/L) or higher suggests diabetes. This is most likely if you also have symptoms of diabetes, such as urinating often and being very thirsty. […] 126 mg/dL (7 mmol/L) or higher on two tests is diabetes. […] 200 mg/dL (11.1 mmol/L) or higher after two hours suggests diabetes. […] The American Diabetes Association suggests that all adults age 35 or older have routine tests for type 2 diabetes.
#2 Diabetes Tests & Diagnosis – NIDDK
https://www.niddk.nih.gov/health-information/diabetes/overview/tests-diagnosis
Your doctor can diagnose diabetes, prediabetes, and gestational diabetes using blood tests. The blood tests show if your blood glucose level, also called blood sugar, is higher than the range that is healthy for you. Blood tests can also help identify the type of diabetes you have. […] Anyone who has symptoms of diabetes should be tested for the disease. Some people will not have any symptoms but may have risk factors for type 2 diabetes and need to be tested. Most pregnant women should also be tested for gestational diabetes. Testing helps doctors find diabetes sooner, so they can work with their patients to manage the disease and prevent health problems. […] Doctors often diagnose type 1 diabetes in children and young adults when they have diabetes symptoms, such as feeling thirsty and having to urinate more often, or if they may have diabetic ketoacidosis.
#2 Type 1 Diabetes: Causes, Symptoms, Complications & Treatment
https://my.clevelandclinic.org/health/diseases/21500-type-1-diabetes
If blood glucose test results indicate that you have diabetes, your healthcare provider may do an A1c test. This measures your average blood sugar levels over three months. […] This blood test checks for autoantibodies to determine if you have Type 1 or Type 2 diabetes. Autoantibodies are proteins that attack your bodys tissue by mistake. The presence of certain autoantibodies means you have Type 1 diabetes. Autoantibodies usually arent present in people who have Type 2 diabetes. […] People with Type 1 diabetes need synthetic insulin every day, multiple times a day in order to live and be healthy. They also need to try to keep their blood sugar within a healthy range. […] Since several factors affect your blood sugar level, Type 1 diabetes management is complex and highly individualized.
#2 Type 1 Diabetes Mellitus Workup: Laboratory Studies, Tests to Differentiate Type 1 from Type 2 Diabetes
https://emedicine.medscape.com/article/117739-workup
The 2022 guidelines from the American Association of Clinical Endocrinologists (AACE) note that the methodology for distinguishing between type 1 and type 2 DM includes observance of the clinical presentation as well as, for a diagnosis of type 1 DM, positive autoantibody tests to glutamic acid decarboxylase (GAD65), pancreatic islet b cells (tyrosine phosphatase IA-2), and IA-2b zinc transporter (ZnT8), and/or insulin. […] Most patients who present with undiagnosed type 1 DM have the classic symptoms of uncontrolled hyperglycemia, including polyuria, polydipsia, nocturia, fatigue, and weight loss. In these patients, a confirmatory random plasma glucose level of greater than 200 mg/dL is adequate to establish the diagnosis of DM. […] Islet cell antigen (ICA) 512 (abbreviated IA-2), anti-GAD65, and anti-insulin autoantibodies can be present in early type 1 but not type 2 DM. Measurements of IA2 autoantibodies within 6 months of diagnosis can help to differentiate between type 1 and type 2 DM.
#2 Azthena logo with the word Azthena
https://www.news-medical.net/health/Type-2-Diabetes-Diagnosis.aspx
Diabetes is diagnosed using tests to assess blood glucose levels. The basic problem in diabetes is the presence of high levels of sugar in the blood and urine which leads to various complications. […] If a patient presents with symptoms of diabetes, a blood test is performed to check the blood glucose level. Sometimes, in the absence of symptoms, a high blood sugar may be detected by routine blood tests performed as part of a general health check-up. An early diagnosis often helps prevent or delay the onset of complications associated with type 2 diabetes. […] A random blood sugar test is performed. Diabetes is diagnosed on the basis of a single abnormal plasma glucose reading. When taken randomly at any time of the day, the levels are considered high if they are 11.1 mmol/L or higher.
#2 Recommendation: Prediabetes and Type 2 Diabetes: Screening | United States Preventive Services Taskforce
https://www.uspreventiveservicestaskforce.org/uspstf/recommendation/screening-for-prediabetes-and-type-2-diabetes
The USPSTF recommends screening for prediabetes and type 2 diabetes in adults aged 35 to 70 years who have overweight or obesity. […] Screening asymptomatic adults for prediabetes and type 2 diabetes may allow earlier detection, diagnosis, and treatment, with the ultimate goal of improving health outcomes. […] Prediabetes and type 2 diabetes can be detected by measuring fasting plasma glucose or HbA1c level, or with an oral glucose tolerance test. […] A fasting plasma glucose level of 126 mg/dL (6.99 mmol/L) or greater, an HbA1c level of 6.5% or greater, or a 2-hour postload glucose level of 200 mg/dL (11.1 mmol/L) or greater are consistent with the diagnosis of type 2 diabetes. […] A fasting plasma glucose level of 100 to 125 mg/dL (5.55-6.94 mmol/L), an HbA1c level of 5.7% to 6.4%, or a 2-hour postload glucose level of 140 to 199 mg/dL (7.77-11.04 mmol/L) are consistent with prediabetes.
#2 Diabetes â screening and diagnosis | Healthify
https://healthify.nz/health-a-z/d/diabetes-screening-and-diagnosis
Diabetes can also occur in children. […] For this reason, obese children and young people should have a screening blood test for diabetes, especially if there are other people in the whnau/family who have diabetes. […] This is why all pregnant women should be screened for diabetes. […] A blood test called an HbA1c is done to measure the amount of glucose that has built up in your blood over a 3-month period. […] The HbA1c blood test can be done at any time of the day and you do not need to fast (stop eating for several hours) beforehand. […] If you have symptoms of diabetes (such as excessive thirst, frequent peeing, or recurrent infections), only one high HbA1c result (50 mmol/mol or higher) is needed to confirm the diagnosis. […] If you do not have symptoms of diabetes, 2 high HbA1c results (50 mmol/mol or higher) are needed to confirm the diagnosis.
#2 Testing for Type 2 Diabetes: Getting a Type 2 Diabetes Diagnosis
https://www.health.com/type-2-diabetes-diagnosis-6889338
Gestational diabetes is usually diagnosed 2428 weeks into pregnancy during standard prenatal check-ups with a healthcare provider. […] Regularly testing your blood sugar levels will give a healthcare provider a clear picture of your health status and allow them to provide you with an accurate diagnosis.
#2 Diabetes New Zealand
https://www.diabetes.org.nz/diabetes-diagnosis
If you are having a glucose tolerance test to see whether you have diabetes of pregnancy (gestational diabetes), and your blood glucose two hours after the glucose drink is 9mmol/L or more, you have diabetes of pregnancy (gestational diabetes). […] All pregnant women without known diabetes should have an HbA1c performed 20 weeks gestation to detect any undiagnosed pre-gestational diabetes or prediabetes. […] Women who have had GDM have up to a 50% risk of developing type 2 diabetes within 5 years after their babys birth. Consequently, women who have had GDM should have an HbA1c measured three months post-delivery and then annually to ensure they have not developed type 2 diabetes. […] If this level is 11.1mmol/L or more, you have diabetes. […] If you have these antibodies its extremely likely that you will develop Type 1 diabetes.
#2 Diabetes: Symptoms, Causes, Diagnosis, Treatment, and Prevention
https://www.everydayhealth.com/diabetes/guide/
While blood sugar tests can reveal whether a person has diabetes, they cannot always identify the type of diabetes. A healthcare provider may choose to administer additional tests in order to determine if an individual has type 1 diabetes, type 2 diabetes, or a rarer form of the disease. […] These tests, which look for antibodies targeting insulin or certain pancreatic cells, are conducted most often to diagnose type 1 diabetes or LADA. […] This test measures the amount of a protein that mirrors the level of insulin in the body, low levels of which can indicate type 1 diabetes or LADA. […] MODY and neonatal diabetes may be detected using genetic testing. […] Sometimes these additional tests are administered long after an initial diabetes diagnosis, especially if treatment has proven ineffective.
#2 Symptoms, Diagnosis and Monitoring of Diabetes | American Heart Association
https://www.heart.org/en/health-topics/diabetes/symptoms-diagnosis–monitoring-of-diabetes
This test measures how well the body handles a standard amount of glucose. […] If youâre diagnosed with diabetes, you can monitor your blood sugar level several ways to see how well your treatment plan is working: […] Your health care team will do an HbA1C test at least twice a year. […] Easy-to-use home monitors allow people to test their blood sugar on their own. […] People with diabetes are at increased risk for a range of health complications, including cardiovascular disease.
#2 Diagnosis and Management of Type 2 Diabetes | Banner Health
https://www.bannerhealth.com/services/diabetes/type-2/diagnosis-and-treatment
If you are diagnosed with diabetes, your provider may do other tests to confirm if you have type 1 or type 2 diabetes because the two often require different treatments. […] What is the treatment for type 2 diabetes? […] Managing type 2 diabetes involves lifestyle changes, glucose monitoring and medication. […] The main goal of treatment is to keep your blood sugar levels in a healthy range. […] Your provider may prescribe medications to help control your blood sugar. […] Your diabetes care team will show you how to regularly check your blood sugar levels at home. […] Regular check-ups: Keep up with your medical appointments.
#2 Diabetes Mellitus (DM) – Endocrine and Metabolic Disorders – Merck Manual Professional Edition
https://www.merckmanuals.com/professional/endocrine-and-metabolic-disorders/diabetes-mellitus-and-disorders-of-carbohydrate-metabolism/diabetes-mellitus-dm
HbA1C should be assessed quarterly in patients with type 1 diabetes and at least twice a year in patients with type 2 diabetes when plasma glucose appears stable and more frequently when control is uncertain. […] HbA1C levels measured in venous plasma are monitored every 3 months or, for patients with consistently good control, every 6 months. […] Continuous glucose monitoring (CGM) systems estimate capillary blood glucose from interstitial glucose detected by a subcutaneous sensor. […] Use of CGMs has been shown to increase patients’ time in target range (TIR) and decrease HbA1C.
#2 Laboratory Testing for Diabetes Diagnosis and Management | Test Guide | Quest Diagnostics Hereditary Cancer Test Selection GuideHereditary Cancer Test Selection Guide
https://testdirectory.questdiagnostics.com/test/test-guides/TG_Diabetes/laboratory-testing-for-diabetes-diagnosis-and-management
For individuals with prediabetes, annual monitoring for development of diabetes is recommended; frequency of monitoring may be modified based on an individualâs risk-to-benefit assessment. […] Following a diagnosis of diabetes, a combination of laboratory and clinical tests can be used to monitor blood glucose control, detect onset and progression of diabetic complications, and predict treatment response. […] Blood glucose monitoring (BGM) and continuous glucose monitoring (CGM) are useful for tracking short-term treatment responses in insulin-treated patients, but their usefulness is less clear in nonâinsulin-treated patients. […] By contrast, the long-term HbA1c measure should be used as the primary test of glycemic control in all nonpregnant adults with diabetes; lowering HbA1c levels by 1 percentage point reduces the risk of microvascular complications by approximately 40%.
#2 Getting diagnosed
https://www2.hse.ie/conditions/type-2-diabetes/about/getting-diagnosed/
Type 2 diabetes is often diagnosed following blood or urine tests for another reason. […] Your doctor will arrange a blood test to check your blood glucose (sugar) levels. It usually takes a few days for the results to come back. […] Your results will show if you have: no diabetes, type 2 diabetes, pre-diabetes – this is a stage before type 2 diabetes. […] If you have type 2 diabetes or pre-diabetes your doctor will advise you on the best treatment options. […] Your doctor or nurse will discuss your diagnosis with you. […] You should have regular type 2 diabetes check-ups with your doctor, nurse or diabetes team.
#2 What is diabetes | Diabetes Australiachevron
https://www.diabetesaustralia.com.au/about-diabetes/what-is-diabetes/
Your general practitioner may order a second blood test to confirm diabetes if you do not have symptoms. […] Type 1 diabetes is usually confirmed with an extra blood test to check autoantibodies. These are the âdefenceâ proteins the immune system produces, which can stop the pancreas from making insulin. There are five known autoantibodies related to type 1 diabetes. If any of these are high, then that would confirm you have type 1 diabetes.
#2 Diagnosis of diabetes mellitus â GPnotebook
https://gpnotebook.com/pages/diabetes-and-endocrinology/diagnosis-of-diabetes-mellitus
Situations where HbA1c is not appropriate for diagnosis of diabetes include ALL children and young people, patients of any age suspected of having Type 1 diabetes, patients with symptoms of diabetes for less than 2 months, patients at high diabetes risk who are acutely ill, and patients taking medication that may cause rapid glucose rise.
#2 Global variation in diabetes diagnosis and prevalence based on fasting glucose and hemoglobin A1c | Nature Medicine
https://www.nature.com/articles/s41591-023-02610-2
In contemporary guidelines, any one or the combination of fasting plasma glucose (FPG), OGTT and HbA1c may be used to diagnose diabetes. […] FPG and HbA1c, which are both used in clinical practice and epidemiological research and surveillance, measure different glycemic features, namely basal glucose level (FPG) and average glucose level in the previous 23 months (HbA1c). […] Therefore, individuals may have elevated levels of one or both biomarkers, and FPG and HbA1c may classify different people as having diabetes. […] Diabetes also has a long subclinical period defined by hyperglycemia and can remain undiagnosed without screening or other mechanisms for early identification. […] Most population-based studies on the concordance and discordance of diabetes diagnosis using FPG versus HbA1c have been conducted in a single country or region.
#2 Global variation in diabetes diagnosis and prevalence based on fasting glucose and hemoglobin A1c | Nature Medicine
https://www.nature.com/articles/s41591-023-02610-2
Our analysis of pooled global data showed that the use of either FPG or HbA1c alone might substantially underestimate the burden of diabetes relative to the number of people who would have elevated levels of either glycemic measure, especially in low- and middle-income countries where diagnosis rates are currently low. […] The prediction equations can also be used to enhance diabetes surveillance, to adjust the estimated prevalence in the majority of population-based health surveys which measure only one biomarker.
#2 Diabetes Mellitus (DM) – Hormonal and Metabolic Disorders – Merck Manual Consumer Version
https://www.merckmanuals.com/home/hormonal-and-metabolic-disorders/diabetes-mellitus-dm-and-disorders-of-blood-sugar-metabolism/diabetes-mellitus-dm
Diabetes can damage blood vessels and increase the risk of heart attack, stroke, chronic kidney disease, and vision loss. […] Doctors diagnose diabetes by measuring blood sugar levels. […] The diagnosis of diabetes is made when people have abnormally high levels of glucose in the blood. Doctors do screening tests on people who are at risk of diabetes but have no symptoms. […] Diabetes can be diagnosed if fasting blood glucose levels are 126 mg/dL (7.0 mmol/L) or higher. However, it is possible to use blood samples taken after people have eaten. […] Diabetes can be diagnosed if a random (not done after fasting) blood glucose level is higher than 200 mg/dL (11.1 mmol/L). […] Doctors can also measure the level of a protein, hemoglobin A1C, in the blood, which reflects the person’s long-term trends in blood glucose levels rather than rapid changes.
#2 Coping With a Type 2 Diabetes Diagnosis | Diabetes | CDC
https://www.cdc.gov/diabetes/signs-symptoms/coping-with-type-2-diagnosis.html
Being diagnosed with diabetes is a big life change. […] While there’s no cure for type 2 diabetes, there are ways to manage it and thrive. […] Your doctor, diabetes education specialist, and other health care professionals can help you create a plan for your specific needs. […] A successful diabetes management plan will include healthy eating, exercise, medical support, and emotional support. […] You’ve been diagnosed with type 2 diabetes because your body doesn’t use insulin well. […] Because of that, it can’t keep your blood sugar at normal levels. […] Now that you know you have diabetes, you can plan your next steps to help manage it and prevent serious complications. […] People with diabetes are living longer, healthier lives than ever before with fewer complications. […] And help is available through diabetes self-management education and support (DSMES) services.
#2 Coping With a Type 2 Diabetes Diagnosis | Diabetes | CDC
https://www.cdc.gov/diabetes/signs-symptoms/coping-with-type-2-diagnosis.html
With DSMES, you can gain the knowledge, skills, and support needed to successfully manage diabetes. […] A diabetes care and education specialist will be an important part of your health care team. […] Your plan will be specific to your health needs, lifestyle, beliefs, and culture. […] DSMES has been proven to help improve A1C, blood pressure, and cholesterol levels. […] Eating healthy foods lower in carbohydrates, added sugars, saturated fat, and sodium (salt) will be key to managing your blood sugar. […] One of the best ways to manage diabetes is to get regular physical activity. […] Regular physical activity has many other health benefits as well, like better sleep, weight loss, and less stress. […] You’re not alone, so don’t go it aloneconnect with others living with type 2 diabetes. […] Your diabetes diagnosis may come with big life changes. […] With the right diabetes management plan, you’ll be able to live your best life while successfully managing your diabetes. […] Diabetes is a chronic disease that affects how your body turns food into energy.
#2
https://www.racgp.org.au/clinical-resources/clinical-guidelines/key-racgp-guidelines/view-all-racgp-guidelines/management-of-type-2-diabetes/defining-and-diagnosing-type-2-diabetes
Assessing the risk of diabetes is recommended every 3 years for those in the general population aged 40 years without specific risk factors. Use a validated screening tool to assess the risk of diabetes, such as the Australian type 2 diabetes risk assessment tool (AUSDRISK). […] All adults aged 18 years and over should be screened on an opportunistic basis and/or annually. […] Measure fasting blood glucose (FBG) or glycated haemoglobin (HbA1c): A laboratory test is preferable, but fingerprick testing is an alternative. If an FBG is impractical, perform a random (non-fasting) venous test or an HbA1c (which is not affected by fasting status). […] Perform an oral glucose tolerance test (OGTT) in those with equivocal results (FBG 5.5-6.9 mmol/L, or random glucose 5.5-11.0 mmol/L). […] Type 2 diabetes is a chronic and progressive medical condition that results from two major metabolic dysfunctions: insulin resistance followed by pancreatic islet cell dysfunction, causing a relative insulin deficiency.
#2
https://www.racgp.org.au/clinical-resources/clinical-guidelines/key-racgp-guidelines/view-all-racgp-guidelines/management-of-type-2-diabetes/defining-and-diagnosing-type-2-diabetes
The relative insulin deficiency leads to chronic hyperglycaemia and multiple disturbances in carbohydrate, protein and fat metabolism. […] Type 2 diabetes is the most common form of diabetes in Australia. […] Clinical suspicion for type 2 diabetes needs to remain high, because type 2 diabetes is often asymptomatic and is increasingly developing in younger people. […] People should be assessed for diabetes risk every three years from the age of 40 years using the Australian type 2 diabetes risk assessment tool (AUSDRISK). […] It is recommended that all people at high risk are tested every three years for diabetes with either FBG or a non-fasting HbA1c. […] People who do not have symptoms of hyperglycaemia but who fall in the high-risk categories cited above, or people for whom there is clinical suspicion of diabetes, should be tested using FBG, HbA1c or OGTT.
#2
https://www.racgp.org.au/clinical-resources/clinical-guidelines/key-racgp-guidelines/view-all-racgp-guidelines/management-of-type-2-diabetes/defining-and-diagnosing-type-2-diabetes
A second concordant laboratory result is required to confirm a diagnosis of diabetes in asymptomatic people. […] The presence of symptoms suggestive of hyperglycaemia with one of the following is confirmatory of a diagnosis of diabetes: a single elevated FBG 7.0 mmol/L or single HbA1c 6.5% or a random blood glucose 11.1 mmol/L. […] Three laboratory tests can be used to diagnose type 2 diabetes: FBG, HbA1c, OGTT. […] Diagnostic criteria differ depending on whether a person is symptomatic or asymptomatic.
#2
https://www.who.int/news-room/fact-sheets/detail/diabetes
Diabetes can be treated and its consequences avoided or delayed with diet, physical activity, medication and regular screening and treatment for complications. […] Early diagnosis can be accomplished through relatively inexpensive testing of blood glucose. […] Gestational diabetes is diagnosed through prenatal screening, rather than through reported symptoms. […] The best way to detect diabetes early is to get regular check-ups and blood tests with a healthcare provider. […] WHO develops norms and standards for diabetes diagnosis and care.
#2 Diabetes Facts and Figures | International Diabetes Federation
https://idf.org/about-diabetes/diabetes-facts-figures/
Diabetes facts and figures show the growing global burden for individuals, families, and countries. The latest IDF Diabetes Atlas (2025) reports that 11.1% or 1 in 9 of the adult population (20-79 years) is living with diabetes, with over 4 in 10 unaware that they have the condition. […] However, it is possible to reduce the impact of diabetes by taking preventive measures for type 2 diabetes and providing early diagnosis and proper care for all types of diabetes. These measures can help people living with the condition avoid or delay complications. […] The total number of people living with diabetes is projected to rise to 853 million by 2045. […] First published in 2000, the IDF Diabetes Atlas is the authoritative resource on the global impact of diabetes. It provides statistics on diabetes prevalence, diabetes-related mortality and health expenditure at the global, regional and national level.
#3
https://myhealth.alberta.ca/Health/pages/conditions.aspx?Hwid=tj4293
Doctors use blood tests and follow guidelines from experts to diagnose diabetes. You will be diagnosed with diabetes if you meet one of the following criteria: You have symptoms of diabetes and a blood sugar level equal to or greater than 11.1 mmol/L. Your fasting blood sugar level is equal to or greater than 7.0 mmol/L. Your 2-hour oral glucose tolerance test result is equal to or greater than 11.1 mmol/L. Your hemoglobin A1c result is 6.5% or higher. Two tests are used to confirm the diagnosis of diabetes. […] You may be diagnosed with prediabetes if your blood sugar is above normal but not high enough to be diabetes. You have prediabetes if you meet one of the following criteria: Your fasting blood sugar test results are between 6.1 mmol/L and 6.9 mmol/L. Your OGTT result is between 7.8 mmol/L and 11.0 mmol/L (2 hours after you start the test). Your hemoglobin A1c result is 6.0% to 6.4%. […] If so, your doctor may do a C-peptide test or test for autoantibodies to diagnose type 1 diabetes or a slowly developing form of type 1 diabetes called latent autoimmune diabetes in adults (LADA).