HbA1c - Overview

Alternative Names

Glycated hemoglobin; Glycosylated hemoglobin; Hemoglobin - glycosylated; A1C; GHb; Glycohemoglobin; Diabetic control index

Definition of HbA1c:

HbA1c is a lab test that shows the average amount of sugar in your blood over 3 months. It shows how well you are controlling your diabetes.

How the test is performed:

A blood sample is needed. For information on how this is done, see: Venipuncture.

How to prepare for the test:

No special preparation is needed.

How the test will feel:

When the needle is inserted, you may feel a slight pinch or some stinging. Afterward, there may be some throbbing.

Why the test is performed:

Your doctor may order this test if you have diabetes. It shows how well you are controlling your diabetes.

The test may also be used to screen for diabetes.

Reviewed last on: 6/28/2011
Ari S. Eckman, MD, Chief, Division of Endocrinology, Diabetes and Metabolism, Trinitas Regional Medical Center, Elizabeth, NJ. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

References

American Diabetes Association. Standards of medical care in diabetes--2011. Diabetes Care. 2011 Jan;34 Suppl 1:S11-61.

Diabetes

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