A normal A1C diabetic reading is below 5.7 percent. Levels ranging from 5.7 to 6.4 percent indicate prediabetes, and levels at 6.5 percent or higher indicate diabetes, notes Healthline.
The A1C test is a blood test that measures the amount of hemoglobin in the blood that has glucose attached to it. It is used to diagnose prediabetes, Type 1 diabetes and Type 2 diabetes. The initial test helps establish a baseline A1C level that a physician can use to develop a treatment plan. The frequency of subsequent testing depends on the type of diabetes and how well the patient is managing their blood sugar, explains Mayo Clinic.