Glucose Testing

Medically Reviewed by Traci C. Johnson, MD on June 09, 2023
Written by R. Morgan Griffin
2 min read

All women should get glucose testing during pregnancy. It's a standard test. It's especially important if you're having twins, because your risk of diabetes is higher.

Glucose testing checks for a type of diabetes that can start when you're pregnant. Gestational diabetes is common and treatable. It usually goes away after birth. Without treatment, it can cause problems during pregnancy.

There are few basic tests. The glucose challenge screening tests how your body is processing blood sugar. If the results are abnormal, you will get a follow-up test. It's called a glucose tolerance test. If that's positive, you'll get treatment to get your glucose under control and keep your baby healthy.

Some women also get a blood test to check glucose called the A1C.

Glucose tests are harmless to you and your baby. During the glucose challenge screening, you'll drink a small amount of glucose. After an hour, a nurse or phlebotomist will take a blood sample.

For the follow-up glucose tolerance test, you'll have to adjust your diet for a few days. Then you'll fast for 8 to 14 hours before the test. A nurse or phlebotomist will test your blood and then give you glucose. After that, they will take three more blood samples over the next few hours.

The A1C test is a simple blood test to check long-term glucose levels.

If you do have a positive result, try not to worry too much. Diabetes during pregnancy is common. As many as 1 in 10 pregnant women get it. Most have normal pregnancies and healthy babies.

Your doctor may recommend extra testing to check on your baby. You will need to keep your blood sugar under control with diet, exercise, and sometimes medicine.

Women who have gestational diabetes have an increased risk of developing diabetes later in life.

Women get glucose testing at 26 to 28 weeks.  Some women also get testing for glucose in early pregnancy if they have additional risk factors. If it turns out that you have diabetes, you'll get regular testing for the rest of your pregnancy. Your doctor may do an A1C blood test at your first prenatal check-up.

Glucose challenge screening, glucose tolerance test, A1c test