The card shows an example result of 7.6 %, which is 7.00 SD above the mean.

What it measures

Glycated haemoglobin is haemoglobin with glucose attached. Red blood cells last about three months, so it reflects average glucose over that time.

Reference range

The mean is (low + high) / 2 and the SD is (high − low) / 4, so the healthy range covers Z from −2 to +2.

Reading the result

• High — 5.7 to 6.4% suggests prediabetes and 6.5% or more suggests diabetes.
• Low — Not a concern.

Notes

• Anaemia, recent blood loss, and some haemoglobin variants make it less reliable.
• This page is general information, not medical advice. Discuss results with a clinician.