For people without diabetes, the normal levels for an A1C test are between 4.5 and 6 percent, according to Mayo Clinic. The A1C is a test commonly used to diagnose diabetes because it provides an estimation of average blood sugar levels for past two months.
When A1C levels are more than 8 percent, this indicates that a person has had uncontrolled blood glucose levels and untreated diabetes for a long time, explains Mayo Clinic. For people whose diabetes is being monitored and treated, the common target for the A1C test is a result less than 7 percent. When the A1C result increases for a person, this indicates they may need different medications or treatment plans.