HbA1c Test Explained: What Your Number Means for Diabetes
What is HbA1c, what is a normal level, and what number means prediabetes or diabetes? A physician in Gachibowli explains the test and how often to repeat it.
By Dr Sujith ChadalaMBBS, MD (General Medicine)
What is HbA1c?
Haemoglobin is the protein in red blood cells that carries oxygen. When sugar circulates in the blood, a small amount sticks to haemoglobin. The higher your sugar has been, the more "glycated" haemoglobin — HbA1c — you have.
Red blood cells live for about three months, so HbA1c works like a rolling average of your blood sugar over the last 8–12 weeks. A single fasting test tells you about one morning. HbA1c tells you about the whole season.
HbA1c ranges at a glance
| HbA1c | What it usually means |
|---|---|
| Below 5.7% | Normal |
| 5.7% – 6.4% | Prediabetes (higher risk of diabetes) |
| 6.5% or higher (confirmed) | Diabetes |
A diagnosis of diabetes is normally confirmed with a repeat test or together with a high fasting or post-meal sugar, unless symptoms and sugar levels are clearly very high.
What HbA1c target should I aim for?
For many adults with diabetes, a target below 7% lowers the risk of eye, kidney and nerve damage. But one number does not suit everyone:
- Younger adults with recent diabetes and no complications may safely aim lower, around 6.5%.
- Older adults, people with heart or kidney disease, or anyone who gets frequent low sugars may be safer at 7.5–8%.
- Pregnancy needs tighter, specialised targets.
Your physician sets your target with you and explains why.
Why your HbA1c might not match your glucometer
It is common to see good morning readings yet a high HbA1c. Usually that is because sugar rises after meals or overnight — times you are not checking. A few post-meal readings (two hours after starting a meal) often explain the gap.
Less often, the test itself is affected by anaemia, kidney disease, recent bleeding or an unusual haemoglobin type. If the numbers do not fit together, tell your doctor.
How to bring HbA1c down
- Know your pattern. Check fasting and post-meal sugar on a few days each week before your review.
- Look at the plate. Smaller portions of rice and rotis, more vegetables and dal, and fewer sweets and sugary drinks make a measurable difference.
- Move after meals. A 10–15 minute walk after lunch and dinner blunts sugar spikes.
- Sleep and stress. Poor sleep and long sitting hours — common in IT jobs — push sugar up.
- Take medicines as prescribed. If side effects or cost are a problem, say so; there is usually an alternative.
HbA1c usually takes about three months to fully reflect a change, so be patient between tests.
When to see a doctor
Book a consultation if your HbA1c is 5.7% or higher, if it has risen since your last test, or if you have symptoms such as thirst, frequent urination, tiredness or weight loss. Seek urgent care for very high sugar with vomiting, abdominal pain, fast breathing or drowsiness.
Read more about diabetes care in Gachibowli or book an appointment.
Frequently asked questions
Do I need to fast for an HbA1c test?
No. HbA1c can be checked at any time of day without fasting, because it reflects your average sugar over two to three months rather than a single moment.
How often should HbA1c be checked?
Usually every three months while treatment is being adjusted, and every three to six months once your sugar is stable and on target.
Can HbA1c be wrong?
Yes. Anaemia, recent blood loss or transfusion, pregnancy, kidney disease and some haemoglobin variants can make HbA1c misleading. Your doctor will then rely more on fasting and post-meal sugar or glucose monitoring.
This article is for general education only and is not a substitute for professional medical advice, diagnosis or treatment. Please consult Dr Sujith Chadala or another qualified doctor about your specific situation. Created with AI assistance.