This lab test measures the average blood sugar level for the past 2-3 months. It is important as it can help diagnose diabetes mellitus.
Hemoglobin A1c Overview
Reviewed: April 21, 2014
Hemoglobin (A1c) is a blood test that checks the amount of sugar (given as a percent) bound to the hemoglobin in the red blood cells. This test gives an average blood sugar level over the past 2 to 3 months.
Hemoglobin (A1c) is measured as a percentage.
- The normal level is less than 7% in a diabetic adult.
- The normal level is less than 5% in a non diabetic adult.
Fasting is not required before the test.
What the results mean
Hemoglobin A1c of 5.8% to 6.4% indicates prediabetes.
Hemoglobin A1c of 6.5% and higher indicates diabetes.