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What Is the A1C Test?

The A1C blood test is used in the diagnosis and treatment of type one and type two diabetes. Other names for the test include hemoglobin A1C, glycated hemoglobin, glycosylated hemoglobin and HbA1C.

  1. Time Frame

    • The A1C test measures a person's blood sugar level over a 120-day period.

    Function

    • The A1C test determines what percentage of hemoglobin, a protein in red blood cells, is coated with sugar. A higher A1C number indicates poorer blood glucose control.

    Testing Schedule

    • According to the American Diabetes Association, every diabetic should have an A1C test performed a minimum of twice a year, with more frequent testing for those with poor control or changes in treatment.

    Considerations

    • Fasting is not required for the A1C test.

    Results

    • According to the Mayo Clinic, a normal A1C for non-diabetics is between 4.5 and 6 percent. A result of 6.5 or higher on more than two occasions indicates a diabetic diagnosis.

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