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Exams and Tests

The U.S. Preventive Services Task Force recommends that all women who are not already diagnosed with diabetes be tested for gestational diabetes after the 24th week of pregnancy.1

The American Diabetes Association (ADA) recommends that all pregnant women who are not already diagnosed with diabetes be tested for gestational diabetes between the 24th and 28th weeks of pregnancy. The method for testing may vary. Experts think that each method works as well as the other one.2

The first method can be done in two steps. You do not need to stop eating or drinking before the first step. In this step, you drink a liquid that contains 50 grams of sugar (glucose). Your blood sample is taken 1 hour later. If you don't have a lot of sugar in your blood, you do not have gestational diabetes. If you do have a lot of sugar in your blood, you will be asked to do the second step, the oral glucose tolerance test (OGTT).

With the OGTT, you cannot eat or drink for at least 8 hours before the test. You will drink a liquid that contains 100 grams of sugar (glucose). Your blood sample is taken 3 hours later to see how much sugar is in your blood. If you don't have a lot of sugar in your blood, you don't have gestational diabetes. If you do have a lot of sugar in your blood, you do have gestational diabetes.

Some experts do not use the two-step method. They just use another version of the OGTT step. You cannot eat or drink for at least 8 hours before the test. You will drink a liquid that contains 75 grams of sugar (glucose). Your blood sample is taken 1 and then 2 hours later to see how much sugar is in your blood. If you don't have a lot of sugar in your blood, you do not have gestational diabetes. If you do have a lot of sugar in your blood, you do have gestational diabetes.

Tests during pregnancy

If you have gestational diabetes, your doctor will check your blood pressure at every visit. You will also have certain tests throughout your pregnancy to check your and your baby's health. These tests include:

  • Home blood sugar monitoring. Testing your blood sugar helps you know if your blood sugar level is within a target range.
  • Fetal ultrasound. This test may be used to estimate the age, weight, and health of your baby. The ultrasound test also can measure the size of your baby's head and abdomen. This measurement along with other information can be used to help your doctor decide on your care.
  • Nonstress test. A nonstress test can help you know how well your baby is doing by checking your baby's heartbeat in response to movement.

Some doctors may recommend you have a hemoglobin A1c (glycosylated hemoglobin) or a similar test every month during your pregnancy. The A1c test estimates your average blood sugar level over the previous 2 to 3 months.

actionset.gifGestational Diabetes: Checking Your Blood Sugar

WebMD Medical Reference from Healthwise

Last Updated: January 28, 2014
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
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If the level is below 70 or you are experiencing symptoms such as shaking, sweating or difficulty thinking, you will need to raise the number immediately. A quick solution is to eat a few pieces of hard candy or 1 tablespoon of sugar or honey. Recheck your numbers again in 15 minutes to see if the number has gone up. If not, repeat the steps above or call your doctor.

People who experience hypoglycemia several times in a week should call their health care provider. It's important to monitor your levels each day so you can make sure your numbers are within the range. If you are pregnant always consult with your health care provider.

Congratulations on taking steps to manage your health.

However, it's important to continue to track your numbers so that you can make lifestyle changes if needed. If you are pregnant always consult with your physician.

Your level is high if this reading was taken before eating. Aim for 70-130 before meals and less than 180 two hours after meals.

Even if your number is high, it's not too late for you to take control of your health and lower your blood sugar.

One of the first steps is to monitor your levels each day. If you are pregnant always consult with your physician.

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