Glycosylated Hemoglobin Test

(HbA1c; GHb; Glycohemoglobin; Diabetic Control Index)


A glycosylated hemoglobin test (HbA1c) is a blood test that measures the percentage of hemoglobin (a protein found in blood red cells) that has attached to glucose. The higher your blood sugar is, the more that glucose gets attached to your hemoglobin.
glucose and RBC
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Reasons for Test

HbA1c shows how high your blood sugar levels have been during the past 3 months. This can help your doctor determine how well you are controlling your diabetes. Your doctor may also use HbA1c to test you for diabetes.

Possible Complications

There are no major complications associated with this test.

What to Expect

Description of Test

You will be asked to sit. An area inside your elbow will be cleaned with an antiseptic wipe. A large band will be tied around your arm. The needle will then be inserted into a vein. A tube will collect the blood from the needle. The band on your arm will be removed. After all the blood is collected, the needle will be removed. Some gauze will be placed over the site to help stop bleeding. You may also be given a bandage to place over the site. The process takes about 5-10 minutes.

After Test

Apply pressure to the site until bleeding stops.

How Long Will It Take?

Less than 5 minutes

Will It Hurt?

It may hurt slightly when the needle is inserted.


Talk to your doctor about what goal is right for you. If your HbA1c levels are high, you may need a change in treatment, such as:
  • Changing your medications
  • Increasing your level of physical activity
  • Modifying your diet
Talk with your doctor about when you should be tested again.

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