HbA1c
WHO/ADA: ≥6.5 % (48 mmol/mol) is the diagnostic threshold for diabetes; a better long-term indicator than a single glucose measurement.
| Rating | Range | What it means |
|---|---|---|
| Good | below 5.7 % | Average blood sugar (3 months) within range. |
| Worth improving | 5.7 – 6.5 % | Prediabetic range — manageable with lifestyle. |
| Talk to a doctor | 6.5 % and above | Above the diabetes threshold — confirmation by a doctor. |
Why it matters
WHO/ADA: ≥6.5 % (48 mmol/mol) is the diagnostic threshold for diabetes; a better long-term indicator than a single glucose measurement.
If it’s low
A low HbA1c is mostly favorable; a markedly low value is rare (anemia and rapid red-cell turnover can distort the result).
If it’s high
An elevated HbA1c means your blood sugar has been high on average over the past months. 42–47 mmol/mol = prediabetes (a warning, reversible); ≥48 = the diabetes range (confirmed by a doctor).
What to do
The prediabetes range is an opportunity — with movement, fiber and weight loss it often reverses. The effect on HbA1c is not seen until ~8–12 weeks (wait for the recheck).
Read together with
Fasting glucose · Fasting insulin · Triglycerides
Part of the guide: Blood sugar & insulin →
Articles about this marker
- Blood biomarkers of metabolic health: what to measure and whyMetabolic health
- Blood sugar and HbA1c: what they mean and how to calm themMarker explained
- Blood test reference values — table by test for adultsReading your report
- Blood tests before pregnancy: what to check before you conceiveLife stages
- How to steady your blood sugar: an action planHow to improve
- Longevity habits: how to extend your healthy years (healthspan)Longevity
This content is for information only and is not a substitute for medical advice. Talk to your doctor about your results.
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