🩸 Glucose & HbA1c Diagnosis
Estimate average glucose (eAG) from HbA1c and grade it, with the ADA diabetes and prediabetes diagnostic criteria. Browser-side, instant.
Glucose & HbA1c Diagnosis
HbA1c (%)
When to use
Translate an A1c into an estimated average glucose and check it against the diagnostic thresholds.
How it works
eAG (mg/dL) = 28.7 × A1c − 46.7. Diabetes A1c ≥ 6.5%, FPG ≥ 126 mg/dL, OGTT 2 h ≥ 200; prediabetes A1c 5.7–6.4%.
Key points
- Point-of-care A1c is not for diagnosis — use a lab NGSP-standardised method.
- Without symptoms, two abnormal results are needed to diagnose.
- Anaemia/haemolysis/transfusion/Hb variants/pregnancy/CKD distort A1c.
- Gestational diabetes uses dedicated criteria.
References
Decision support for licensed clinicians only; not a substitute for clinical judgement, diagnosis or local protocols.