The HbA1c test is a blood test that shows your average blood sugar level over the past 2–3 months. It measures how much sugar is attached to haemoglobin in your red blood cells. An HbA1c below 5.7% is normal, 5.7–6.4% indicates prediabetes, and 6.5% or above suggests diabetes. No fasting is needed.
What does the HbA1c test measure?
When sugar circulates in your blood, some of it sticks permanently to haemoglobin, the oxygen-carrying protein in red blood cells. Red cells live for roughly three months, so the percentage of “sugar-coated” haemoglobin reflects your average blood sugar over that period.
That makes HbA1c different from a fasting sugar test, which is a snapshot of one morning. A single sweet-heavy festival week or a skipped dinner barely moves HbA1c, so it is a more stable picture of long-term control. Doctors use it to:
- Screen for and diagnose type 2 diabetes and prediabetes.
- Monitor control in people already diagnosed, typically every 3–6 months.
- Estimate average glucose (eAG): Many reports convert HbA1c into an average sugar in mg/dL. For example, 7% corresponds to roughly 154 mg/dL.
India has one of the world’s largest populations living with diabetes, and many cases are found late. Because HbA1c needs no fasting, it is an easy addition to any workplace or annual checkup.
HbA1c normal range
(confirmed with a repeat test)
Where does your result fall?
Enter your HbA1c value from your report.
A general guide, not a diagnosis. The reference range on your own report takes priority, and a doctor should interpret any result outside it.
Cut-offs follow American Diabetes Association criteria, widely used in India. Results can mislead with anaemia, a haemoglobin variant (such as thalassaemia trait), recent blood loss or a transfusion. Ranges vary between labs and methods. Always compare your result with the reference range printed on your own report.
What abnormal results can mean
- 5.7–6.4%: Higher risk of developing diabetes. This range is often reversible with weight, diet and activity changes.
- 6.5% or above: Suggests diabetes. Your doctor will confirm and plan treatment.
- Rising values on treatment: Control may need review.
Who should get this test?
- Adults over 30 in India, as part of a yearly checkup (South Asians develop diabetes earlier and at lower body weights).
- Anyone with risk factors: excess weight around the waist, family history of diabetes, high blood pressure, high triglycerides, past gestational diabetes, or PCOS.
- People with symptoms: frequent urination, unusual thirst, slow-healing wounds or blurred vision.
- People with diabetes: every 3 months if not at target, every 6 months if stable.
- Preparation: None. No fasting needed, any time of day.
This page is for general information and is not a substitute for medical advice. Always interpret your results with a qualified doctor.