Desired Range in Nondiabetics

• The hemoglobin A1c test results for a nondiabetic are between 4 and 6 percent, according to the American Diabetes Association.
  
  

Desired Range in Diabetics

• Diabetics should aim to keep their A1c as close to the level of a nondiabetic as possible. Results of 7 percent or higher are linked to an increase in diabetic complications.
  
  

Frequency of Testing

• Diabetics should have their A1c tested every three months. After consultation with their doctor, they may choose to have A1c tested less frequently if levels are consistently in the desired range, but not less often than twice a year.
  
  

Factors That Can Affect A1c Levels

• Anemia, kidney disease or liver disease can affect A1c results, as can certain vitamin supplements. The patient's doctor should be aware of all present health conditions and all supplements being taken.
  
  

Estimated Average Glucose

• A calculator on diabetes.org allows users to translate their A1c to an estimated average glucose. For example, an A1c of 7 is equivalent to an estimated average blood sugar level of 154.