HbA1c (Glycated Hemoglobin) Test

Do I need to fast for HbA1c?

No, unlike fasting blood glucose, HbA1c doesn't require fasting since it measures an average over months rather than your blood sugar at a single moment.

How often should I repeat this test?

Most people with diabetes are advised to test every 3 months if treatment has recently changed, or twice a year once blood sugar is well controlled and stable.

Can HbA1c results be inaccurate in some people?

Yes, conditions that affect red blood cell lifespan — such as certain anemias, recent significant blood loss, or specific hemoglobin variants — can make HbA1c less reliable, and your doctor may use fasting glucose instead in these cases.

What's the difference between HbA1c and fasting glucose?

Fasting glucose reflects your blood sugar at one specific moment, while HbA1c reflects your average blood sugar control over the previous 2–3 months, making it less affected by day-to-day fluctuations.