Diabetes
HbA1c: Normal Range and What a High HbA1c Means
HbA1c reflects your average blood sugar over the past 2–3 months, so it's a steadier picture than a single glucose reading. It's widely used to screen for and monitor diabetes.
Normal HbA1c range
What a high HbA1c means
A higher HbA1c means your average sugar has been running high. In the prediabetes range it's a strong signal to act early, when changes are most effective.
Common causes:
- Excess refined carbs and sugar
- Being overweight
- Low activity
- Family history
What a low HbA1c means
A low HbA1c is usually fine, but in people on diabetes medicine it can indicate frequent low sugars worth reviewing.
Food & lifestyle that help
Favour
- Whole grains, millets and oats
- Vegetables, dal and legumes
- Protein with meals
- Whole fruit in moderation
Limit
- Sugar, sweets and sugary drinks
- White rice, maida and bakery items in excess
- Fried and packaged snacks
When to see a doctor
See a doctor if your HbA1c is 5.7% or higher, to confirm, find a target, and plan diet, activity and any treatment.
See what your whole report means
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Make my free plan →Frequently asked questions
What is a normal HbA1c?
Below 5.7% is normal; 5.7–6.4% is prediabetes and 6.5% or higher indicates diabetes.
How quickly can HbA1c change?
Because it reflects 2–3 months of sugar, meaningful changes usually show over about 3 months of consistent diet and lifestyle change.
Where this comes from
Guidance from public health bodies — we link out so you can read the source rather than take our word for it. See our editorial policy.