Health Library

The Health Library is a collection of health and wellness resources created for learning and accessibility. Select a topic below for related health information or search for a topic in the search bar for more information on other medical conditions.

Spanish Translation

What Is A1c?

Overview

An A1c test is a blood test that checks your average blood sugar level over the past 2 to 3 months. This test also is called a glycohemoglobin test or a hemoglobin A1c test.

The A1c test is one of the tests used to diagnose prediabetes and diabetes. If you have diabetes, this test is done to check how well your diabetes has been managed over the past 2 to 3 months. Your doctor can use this information to adjust your treatment, if needed.

What do the results of an A1c test mean?

The test result is usually given as a percentage. The normal A1c is less than 5.7%. You have a higher risk for diabetes if your A1c is 5.7% to 6.4%. If your level is 6.5% or higher, you have diabetes.

The A1c test result also can be used to find your estimated average glucose, or eAG. Your eAG and A1c show the same thing in two different ways. They both help you learn more about your average blood sugar range over the past 2 to 3 months. A1c is shown as a percentage, while eAG uses the same units (mg/dl) as your glucose meter.

Examples:

  • 6% A1c = 126 mg/dL
  • 7% A1c = 154 mg/dL
  • 8% A1c = 183 mg/dL
  • 9% A1c = 212 mg/dL
  • 10% A1c = 240 mg/dL
  • 11% A1c = 269 mg/dL
  • 12% A1c = 298 mg/dL

Credits

Current as of: April 13, 2022

Author: Healthwise Staff
Medical Review:
E. Gregory Thompson MD - Internal Medicine
Kathleen Romito MD - Family Medicine
Rhonda O'Brien MS, RD, CDE - Certified Diabetes Educator

This information does not replace the advice of a doctor. Healthwise, Incorporated, disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. Learn how we develop our content.