Doctors use the A1C test to check for prediabetes and diabetes. A range of 5.7 to 6.4% suggests a person may have prediabetes. Over 6.5% indicates diabetes. This test also helps doctors monitor ...

The tests used to check for prediabetes or diabetes can help determine a diagnosis. The A1C test is a blood test that measures the percentage of sugar attached to hemoglobin, a protein in red ...