Lab test, explained · Reviewed by the Medical Records Vault clinical team · Last reviewed June 2026
What is HbA1c? Your 3-month blood sugar, explained
HbA1c (glycated hemoglobin) reflects your average blood sugar over roughly the past two to three months, shown as a percentage. It is widely used to screen for and monitor diabetes. Because it is an average, it is less affected by a single meal than a one-off glucose reading.
- Measures
- Average blood sugar over ~2-3 months
- Unit
- Percentage (%)
- Commonly cited bands
- Below 5.7% normal; 5.7-6.4% prediabetes; 6.5%+ diabetes range (confirm with your doctor)
Why it is an average, not a snapshot
Sugar in your blood sticks to hemoglobin, the protein in red blood cells, and stays there for the life of the cell — about two to three months. HbA1c measures how much of your hemoglobin is sugar-coated, so it reflects your average blood sugar over that window rather than the effect of your last meal. That is what makes it useful for seeing the overall trend.
Reading your result
Commonly cited bands are below 5.7% (normal), 5.7-6.4% (prediabetes), and 6.5% or above (in the diabetes range), though ranges can vary by lab and targets are individual. If you already manage diabetes, the trend over time matters more than any single reading.
Questions to ask your doctor
Bring these to your next visit. They are written to help you understand what was already decided — not to second-guess your doctor.
- 1.What is my HbA1c, and what target is right for me?
- 2.Has my HbA1c trend changed since last time?
- 3.Does this change anything about my diet, activity, or medicines?
Common questions
- What is a normal HbA1c level?
- Commonly cited bands are below 5.7% as normal, 5.7-6.4% as prediabetes, and 6.5% or above in the diabetes range, but targets are individual and ranges can vary by lab. Your doctor sets the right target for you based on your age, health, and treatment.
- How is HbA1c different from a normal blood sugar test?
- A blood glucose test is a snapshot at one moment; HbA1c is an average over about two to three months. That makes HbA1c useful for seeing the overall trend rather than the effect of a single meal.
This is an educational explanation, not a diagnosis or medical advice. Medical Records Vault explains what documents say and what is commonly done; it never tells you what you have or what to change. Always consult your doctor for any medical decision.
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