Skip to content

Diabetes Health Center

Select An Article

The Hemoglobin A1c (HbA1c) Test for Diabetes

Font Size

Importance of Hemoglobin A1c Test

The hemoglobin A1c test, also called HbA1c, glycated hemoglobin test, or glycohemoglobin, is an important blood test that shows how well your diabetes is being controlled. Hemoglobin A1c provides an average of your blood sugar control over the past 2 to 3 months and is used along with home blood sugar monitoring to make adjustments in your diabetes medicines.

Hemoglobin is found in red blood cells, which carry oxygen throughout your body. When your diabetes is not controlled (meaning that your blood sugar is too high), sugar builds up in your blood and combines with your hemoglobin, becoming "glycated." The average amount of sugar in your blood can be found by measuring your hemoglobin A1c level. If your glucose levels have been high over recent weeks, your hemoglobin A1c test will be higher.

Recommended Related to Diabetes

Diabetes Complications: What's Your Risk?

Heart attack, stroke, blindness, amputation, kidney failure. When doctors describe these diabetes complications, it may sound melodramatic -- like an overblown worst-case scenario. The truth is, these things can happen when blood sugar, blood pressure, and cholesterol are out of control. "A lot of people don't really think it will happen to them," says David C. Ziemer, MD, director of the Diabetes Clinic at Grady Hospital in Atlanta. "For a lot of folks, the wake-up comes when they actually...

Read the Diabetes Complications: What's Your Risk? article > >

What's a Normal Hemoglobin A1c Test?

For people without diabetes, the normal range for the hemoglobin A1c test is between 4% and 5.6%. Hemoglobin A1c levels between 5.7% and 6.4% indicate increased risk of diabetes, and levels of 6.5% or higher indicate diabetes. Because studies have repeatedly shown that out-of-control diabetes results in complications from the disease, the goal for people with diabetes is a hemoglobin A1c less than 7%. The higher the hemoglobin A1c, the higher the risks of developing complications related to diabetes.

People with diabetes should have this test every 3 months to determine whether their blood sugars have reached the target level of control. Those who have their diabetes under good control may be able to wait longer between the blood tests, but experts recommend checking at least 2 times a year.

People with diseases affecting hemoglobin, such as anemia, may get abnormal results with this test. Other abnormalities that can affect the results of the hemoglobin A1c include supplements such as vitamins C and E and high cholesterol levels. Kidney disease and liver disease may also affect the result of the hemoglobin A1c test.

WebMD Medical Reference

Reviewed by Michael Dansinger, MD on February 08, 2015
Next Article:

Today on WebMD

Diabetic tools
Symptoms, diagnosis, treatment, and more.
woman flexing muscles
10 strength training exercises.
 
Blood sugar test
12 practical tips.
Tom Hanks
Stars living with type 1 or type 2.
 
kenneth fujioka, md
Video
Can Vinegar Treat Diabetes
Article
 
Middle aged person
Tool
Home Healthcare
Video
 

Prediabetes How to Prevent Type 2 Diabetes
Article
type 2 diabetes
Slideshow
 
food fitness planner
Tool
feet
Slideshow