For instance, an A1c of 6% corresponds to an average
glucose of 135 mg/dL (7.5 mmol/L), while an
A1c of 9% corresponds to an average
glucose of 240 mg/dL (13.5 mmol/L). The closer a diabetic can keep their A1c to 6%, the better their diabetes is in control. As the A1c increases, so does the risk of complications.