The Hemoglobin A1C test result reflects your average blood sugar level for the past two to three months. Specifically, the A1C test measures what percentage of your hemoglobin — a protein in red blood cells that carries oxygen — is coated with sugar (glycated). The higher your A1C level, the poorer your blood sugar control. And if you have previously been diagnosed with diabetes, the higher the A1C level, the higher your risk of diabetes complications.
This test requires a blood draw. See blood draw options.