For people without diabetes, the normal range for the hemoglobin A1c test is between 4% and 5.6%.Hemoglobin A1c levels between 5.7% and 6.4% indicate increased risk of diabetes, and levels of 6.5% or higher indicate diabetes.he higher the hemoglobin A1c, the higher the risks of developing complications related to diabetes. People with diabetes should have this test every 3 months to determine whether their blood sugars have reached the target level of control.