HbA1c
A blood test that shows your average blood glucose level over the past two to three months.
HbA1c
A blood test that shows your average blood glucose level over the past two to three months.
Also known as
- Glycated haemoglobin
- A1C
What it measures
- The percentage of your haemoglobin that is coated with glucose
Why a doctor may order it
Doctors use it to screen for or diagnose type 2 diabetes and prediabetes, and to monitor how well diabetes is being managed. How often you should be tested depends on your age and risk factors, so ask your provider.
What it helps evaluate
It gives an average picture of blood glucose over time, rather than the level at one moment.
Preparation
Some medicines may affect results, so tell your provider about everything you take and don't stop any medicine unless told to. Tell them if you are pregnant, as this may affect results.
Fasting
MedlinePlus lists no special preparation for an HbA1c test. Ask your provider or the lab if you are unsure.
Important considerations
- Blood glucose changes all the time; HbA1c reflects the average, not today's level.
Discuss results with your doctor
Talk to a doctor about your symptoms and about what your results mean — a single result is not a diagnosis. See a doctor promptly for severe or worsening symptoms.