HbA1c test results are shown as a percentage (%). High HbA1c levels indicate high blood sugar levels. The risk of developing kidney or eye complications increases with the increase in HbA1c value. Hba1c test Normal Range An HbA1c level of less than 5.7% indicates the absence of diabetes and prediabetes. Hba1c test Abnormal Range The HbA1c level of 5.7% to 6.4% is a sign of prediabetes. An HbA1c level of 6.5% or higher indicates diabetes in individuals who were not previously diagnosed with diabetes. People with diabetes use the A1c test to help them better manage their diabetes. However, results may be falsely low or high in individuals of Mediterranean, Southeast Asian, or African descent. People belonging to these regions can order different types of A1c tests.