HbA1c Normal Range — ADA & RSSDI Thresholds
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This gives a picture of your average blood sugar over the past few months, not just today.
HbA1c rolls your recent sugar levels into one telling figure. Your doctor leans on it to gauge how steadily things have run and to shape next steps.
Also known as: A1c, glycated haemoglobin, glycosylated haemoglobin, HbA1c level, haemoglobin A1c
Within a healthy range, lower is generally better here, as it reflects steadier blood sugar over about three months.
Last reviewed: 2026-08-16
What is HbA1c?
HbA1c looks at haemoglobin, the part of red blood cells that carries oxygen. It measures how much blood sugar (glucose) has stuck to it. Because red cells live a while, this reflects your average sugar over about two to three months.
Why is HbA1c tested?
This test shows your blood sugar pattern over months, helping your doctor see how well it is managed.
What is a normal HbA1c range?
- India
- No India-specific national reference interval is published for this parameter; your lab's printed range is the most reliable comparison.
- Global
- <5.7% (normal); 5.7–6.4% (prediabetes); ≥6.5% (consistent with diabetes diagnosis, ADA)
Ranges vary by lab, method and equipment — the range printed on your own report is the one that applies to your result.
Source: [ADA, 2024]
The range printed on a report is usually the reference for people without diabetes [ADA, 2024]. For someone already living with diabetes, the doctor sets an individual target, which is often different [ADA, 2024; RSSDI, 2022]. The ADA notes that targets are individualised by age, other health conditions, and how long someone has had diabetes [ADA, 2024]. Your doctor sets the target that is right for you.
What does a HbA1c of 5.7 mean?
Find your HbA1c result in the table below, then read the band it falls into. Each band names the guideline body it comes from. Always compare against the range printed on your own report.
| If your result is | Band | Source |
|---|---|---|
| Below 5.7 % | Below the prediabetes range | ADA (2024) |
| 5.7–6.5 % | Prediabetes range | ADA (2024) |
| 6.5 % and above | Diabetes range | ADA (2024) |
HbA1c Below 5.7 % — Below the prediabetes range
If your result is 5.0, 5.2, 5.4, 5.5 or anywhere in this band: This sits in the usual range for someone without diabetes. It suggests your average blood sugar has been steady over the past few months.
Source: [ADA, 2024]
Worth asking your doctor
- Is this result normal for someone with my age and family history?
- How often should I check my blood sugar from here?
HbA1c 5.7–6.5 % — Prediabetes range
If your result is 5.7, 5.8, 5.9, 6.0 or anywhere in this band: This is higher than usual but below the diabetes range. It is a common, often reversible signal that your average blood sugar has been creeping up. Many people bring it down with everyday changes.
Source: [ADA, 2024]
Worth asking your doctor
- What does a prediabetes-range result mean for me specifically?
- Which changes to food, activity and weight would help most in my case?
- When should this be repeated to see if it is moving?
HbA1c 6.5 % and above — Diabetes range
If your result is 6.5, 6.6, 6.7, 6.9 or anywhere in this band: This is in the range doctors use to identify diabetes. A single result is usually confirmed with a repeat test before anything is concluded. It is worth discussing with your doctor soon.
Source: [ADA, 2024]
Worth asking your doctor
- Should this be confirmed with a repeat test, and when?
- What do we look at next to understand my blood sugar fully?
- What day-to-day changes would you suggest for me?
HbA1c in mg/dL and SI units
Showing values in %. This is display only — your report's own value does not change.
| Value (%) | Same value (mmol/mol) |
|---|---|
| 5 % | 31 mmol/mol |
| 5.2 % | 33 mmol/mol |
| 5.4 % | 36 mmol/mol |
| 5.5 % | 37 mmol/mol |
| 5.6 % | 38 mmol/mol |
| 5.7 % | 39 mmol/mol |
Source: [IFCC, 2007]
What does a high HbA1c result mean?
A higher HbA1c can mean your average blood sugar has been raised over recent months. Lower values are generally the goal here. It is worth discussing with your doctor.
What does a low HbA1c result mean?
A lower HbA1c usually reflects lower average blood sugar. Very low values can also point to conditions that shorten how long red cells live. Your doctor can explain what it means for you.
What can affect your HbA1c result?
- red blood cell lifespan
- unusual haemoglobin types
- iron-deficiency anaemia (low iron)
- some medicines
- the lab method
In the Indian context
Some Indian populations carry unusual haemoglobin types, such as HbS trait. These can make the HbA1c test less accurate, so your doctor may use another measure instead.
Questions to ask your doctor
About this result
- What does my HbA1c percentage say about my average blood sugar over the last few months?
- Could any condition of mine, such as a haemoglobin variant, make my HbA1c reading less reliable?
What to do next
- Based on my HbA1c, would changes to food, activity or weight be enough, or should we look further?
- Should my HbA1c be read alongside a fasting or after-meal sugar to get the full picture?
About retesting
- How soon should I repeat my HbA1c to see whether it is steady, rising or improving?
- What HbA1c figure would you want me to aim for at my next test, given my age and health?
Frequently asked questions
- What is HbA1c?
- HbA1c looks at haemoglobin, the part of red blood cells that carries oxygen. It measures how much blood sugar (glucose) has stuck to it. Because red cells live a while, this reflects your average sugar over about two to three months. This test shows your blood sugar pattern over months, helping your doctor see how well it is managed.
- What is a normal three-month average sugar test range?
- A typical adult range is around <5.7% (normal); 5.7–6.4% (prediabetes); ≥6.5% (consistent with diabetes diagnosis, ADA). No India-specific national reference interval is published for this parameter; your lab's printed range is the most reliable comparison. Ranges vary by lab, method and equipment — the range printed on your own report is the one that applies to your result.
- What does a high HbA1c result mean?
- A higher HbA1c can mean your average blood sugar has been raised over recent months. Lower values are generally the goal here. It is worth discussing with your doctor.
- What does a low HbA1c result mean?
- A lower HbA1c usually reflects lower average blood sugar. Very low values can also point to conditions that shorten how long red cells live. Your doctor can explain what it means for you.
- What can affect your HbA1c result?
- Several everyday factors can influence it, including red blood cell lifespan, unusual haemoglobin types, iron-deficiency anaemia (low iron), some medicines, the lab method.
Sources
- ADA (2024) — Standards of Medical Care in Diabetes — Classification, Diagnosis, and Glycemic Targets
- RSSDI (2022) — RSSDI clinical practice recommendations for type 2 diabetes in India
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