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What is HbA1c?

3
 min read · 
16 November 2025
What is HbA1c?
If you have type 2 diabetes, your HbA1c level will be tested regularly by your healthcare professional.

HbA1c is your average blood glucose (or blood sugar) level for the last two to three months. It is used to:

  • Diagnose diabetes
  • Monitor people already living with diabetes

If you have diabetes, an ideal HbA1c level is 48mmol/mol (or 6.5% on the older measurement scale) or below.

Aiming for your target level is what’s important.

What does HbA1c mean?

HbA1c is what’s known as glycated haemoglobin. This is made when the glucose (sugar) in your body sticks to your red blood cells.

Your body can’t use the sugar properly, so more of it attaches to your blood cells and builds up in your blood. Red blood cells are active for around 2-3 months, which is why the reading is taken roughly every 3 months.

A high HbA1c means you have too much sugar in your blood.

This means you’re more likely to develop diabetes complications. Things like serious problems with your eyes and feet.

You will need to have your HbA1c levels checked regularly. At a minimum, as part of your annual diabetes review.

If your HbA1c is high or needs more attention, it may be done every three to six months. It is vital not to skip these tests and understand the results. Even a slightly raised HbA1c level puts you at risk of serious complications.

How is HbA1c tested?

The HbA1c test is different from the finger prick test.

The finger prick test is a snapshot of your blood sugar levels at a particular time on a specific day.

Your HbA1c levels will be tested by your healthcare professional. If this hasn’t been arranged for you, contact your GP or diabetes nurse.

Most people will have the test every three to six months. But you may need it more often if

  • you’re planning for a baby,
  • your treatment has recently changed,
  • you’re having problems managing your blood sugar levels.

It is also possible to check these average blood sugar levels at home, but you need to buy a kit. The test by your healthcare professional will be free.

What should my levels be?

If you have diabetes, an ideal HbA1c level is 48mmol/mol (or 6.5% on the old measurement scale) or below. However, it’s important to note that everyone is different.

Your healthcare professional will define a target level that you need to aim for. This might sound a little tricky, but it’s essential that you do everything you can to keep in your target range.

Monitoring your HbA1c levels is a quick blood test and doesn’t require much of your time.

Keeping your HbA1c levels within range can be difficult, but avoiding complications is vital.

Disclaimer

This article is for educational purposes only and should not be used as a substitute for medical advice. Always speak to your doctor, nurse or pharmacist about your individual care. The information reflects NHS and NICE guidance at the time of publication.

Last reviewed: 
November 2025
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