The normal hemoglobin A1c range for nondiabetics is between 4 percent and 5.6 percent, states WebMD. Hemoglobin A1c levels that range from 5.7 percent to 6.4 percent show elevated risk for developing diabetes.
Diabetes is present in patients with hemoglobin A1c levels higher than 6.4 percent. Those diagnosed with the disease typically undergo a hemoglobin A1c test to determine their average blood sugar levels over a period of 2 to 3 months. The results serve as a reference on how well their condition is being managed. The test can take place in the laboratory, at the care provider's office or at home using a special test kit.
The higher the concentration of glucose in the blood, the higher the hemoglobin A1c levels. To avoid diabetes-related complications, the target hemoglobin A1c levels for diabetics is less than 7 percent, notes WebMD.