Hemoglobin A1c is a blood test that checks your average blood sugar level over the past 2 to 3 months. This test also is called a glycohemoglobin test or an A1c test.
The A1c test is done to check how well your diabetes has been controlled over the past 2 to 3 months. Your doctor can use this information to adjust your medicine and diabetes treatment, if needed.
You do not need to stop eating before you have an A1c test. This test can be done at any time during the day, even after a meal.
The health professional taking a sample of your blood will:
The test result is usually given as a percentage. The Canadian Diabetes Association recommends most non-pregnant adults with diabetes aim for an A1c of 7.0% or less.
The A1c test result also can be used to find your estimated average glucose, or eAG. Your eAG and A1c show the same thing in two different ways. They both help you learn more about your average blood sugar range over the past 2 to 3 months.
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Current as of: March 13, 2017
Adam Husney, MD - Family Medicine
& Matthew I. Kim, MD - Endocrinology & David C.W. Lau, MD, PhD, FRCPC - Endocrinology
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