(Tıp, İlaç) Glycated hemoglobin (hemoglobin A1c, Hb1c , HbA1c, or A1C; sometimes also HgA1c) is a form of hemoglobin used primarily to identify the average plasma glucose concentration over prolonged periods of time. It is formed in a non-enzymatic pathway by hemoglobin's normal exposure to high plasma levels of glucose