According to the Centers for Disease Control and Prevention, A1c is a test that sums up how much glucose has stuck to part of the hemoglobin during the past 3–4 months.
Hemoglobin is a substance in the red blood cells that supplies oxygen to the cells of the body. In general, the AIC goal for patients with diabetes is less than 7%.
Starting in year 2010, A1c can also be used to diagnose diabetes. So an A1c of ≥ 6.5 is considered a diagnosis for diabetes. Like any other diagnostic test for diabetes, it should be repeated to confirm a diagnosis.
Answer by: William Hsu, M.D.