Diabetes (sugar ki bimari) is very common in India, and many people do not know they have it. The HbA1c test is one of the simplest ways to check your sugar control. This guide explains what it means and how to read your result.
What is HbA1c?
Hemoglobin is a protein inside red blood cells. When sugar (glucose) is in your blood, some of it sticks to hemoglobin. This sugar-coated hemoglobin is called HbA1c, or glycated hemoglobin.
Red blood cells live for about 3 months. So HbA1c shows your average blood sugar over the last 2 to 3 months, not just today.
That is why it is very useful. One sweet or one skipped meal does not change it much.
HbA1c normal range
These ranges are based on widely used guidelines, such as those of the American Diabetes Association (ADA):
- Normal: below 5.7%
- Prediabetes: 5.7% to 6.4%
- Diabetes: 6.5% or higher
A diagnosis of diabetes is usually confirmed by a doctor with a repeat test or another sugar test. Ranges and methods can differ a little between labs, so always use the reference range printed on your report.
What is prediabetes?
Prediabetes means your sugar is higher than normal but not yet in the diabetes range. It is a warning sign. Many people with prediabetes can bring their levels back toward normal with lifestyle changes, such as:
- Walking or exercising regularly
- Eating less sugar, sweets and refined flour (maida)
- Adding more vegetables, dal and whole grains
- Losing extra weight, especially around the belly
- Sleeping well and managing stress
Talk to your doctor about a plan that suits you.
HbA1c vs fasting blood sugar
Both tests are useful, and doctors often order them together.
- Fasting blood sugar (FBS) shows your sugar at one moment, after 8 to 10 hours of fasting. Common ranges: normal below 100 mg/dL, prediabetes 100 to 125 mg/dL, diabetes 126 mg/dL or higher.
- HbA1c shows the 3-month average and does not need fasting.
Fasting sugar can change from day to day. HbA1c gives a steadier picture.
What is estimated average glucose (eAG)?
Some reports also show "estimated average glucose". It converts your HbA1c into a sugar number in mg/dL, so it is easier to compare with your glucometer readings. For example, an HbA1c of about 7% matches an average sugar of about 154 mg/dL.
When can HbA1c be misleading?
HbA1c depends on red blood cells, so some conditions can affect it:
- Anemia (low hemoglobin), especially iron deficiency
- Recent blood loss or blood transfusion
- Some hemoglobin disorders, like thalassemia trait
- Pregnancy
- Advanced kidney or liver disease
In these cases, your doctor may also use other sugar tests.
How often should you test HbA1c?
- No diabetes, normal result: your doctor may suggest testing every 1 to 3 years, or yearly if you have risk factors.
- Prediabetes: often once a year, or as your doctor advises.
- Diabetes: usually every 3 months if sugar is not under control or treatment has changed, and about every 6 months if it is stable.
Who should get tested?
- Adults above 35 to 40 years, even without symptoms
- People who are overweight
- People with a family history of diabetes
- People with high blood pressure or high cholesterol
- Women who had sugar during pregnancy
- Anyone with symptoms like frequent urination, a lot of thirst, slow healing wounds or blurry vision
Frequently asked questions
Do I need to fast for HbA1c?
No. You can eat normally before an HbA1c test. If it is booked along with fasting sugar or a lipid profile, follow the fasting advice for those tests.
My HbA1c is 6.0%. Do I have diabetes?
A result of 6.0% falls in the prediabetes range, not diabetes. It is a good time to talk to your doctor and make lifestyle changes.
What HbA1c target is good for people with diabetes?
Many adults with diabetes are advised a target below 7%, but the right target is different for each person. Your doctor will set your goal.
Book this test
You can book an HbA1c test or a diabetes package with home sample collection. Book a test, see all tests, or check your report values.
This article is for general information only and is not medical advice. Please talk to your doctor about your symptoms and report.
