3-Hour Gestational Diabetes Test

In order to make sure that a pregnant woman has gestational diabetes, she needs to undergo the 3-hour gestational diabetes test. This test measures the body’s ability to use glucose, thus diagnosing prediabetes and diabetes. It is a very common test that is used for determining whether one has gestational diabetes or not.

Pregnant women have increased chances for having a high 3-hour gestational diabetes test if she was previously diagnosed with gestational diabetes in a past pregnancy. She is also at risk for the condition if she previously gave birth to a baby weighing nine pounds or 4.1 kilograms. Those who are overweight and younger than 25 years old are also at higher risk of getting an abnormal 3-hour gestational diabetes test result.

Preparing for the 3-Hour Gestational Diabetes Test

Before you undergo the 3-hour gestational diabetes test, your doctor will advise you to have a diet containing at least 150 grams of carbohydrates for the three days prior to fasting. Carbohydrate-rich foods include cereals, breads, grains, fruits, rice, crackers, potatoes, and corn. Eight to 14 hours before the test, you are not allowed to drink or eat anything. You are also discouraged from exercising or smoking because these can affect the results of the 3-hour gestational diabetes test. Some medications may also affect the test, so it is important to tell your doctor about them so that he can tell you whether those drugs can affect the test or not.

How the 3-Hour Gestational Diabetes Test is Done

During the duration of the 3-hour gestational diabetes test, you will be asked to sit quietly since physical activity can have an effect on the test. You are also not allowed to drink or eat anything during the duration of the test, other than water and the solution that will be given to you for consumption.

Upon arrival, your fasting blood sample will be collected. This will serve as the baseline for the rest of the results that will be collected during the 3-hour gestational diabetes test. You will then be asked to drink 75 grams of a sweet, glucose-filled syrupy liquid. Several blood samples will be extracted after one, two, or three hours. Although it is best to drink the liquid in one go, you might feel sick and nauseous and might feel the need to vomit, which will only prevent you from accomplishing the 3-hour gestational diabetes test. Therefore, it is advised that you drink the liquid at your own pace.

Results of the 3-Hour Gestational Diabetes Test

The normal values for the 3-hour gestational diabetes test are as follows. It is measured in milligrams per deciliters (mg/dl).

  • Fasting glucose – less than 95 mg/dl
  • One hour later – less than 180 mg/dl
  • Two hours later – less than 155 mg/dl
  • Three hours later – less than 140 mg/dl

If your 3-hour gestational diabetes test results go over these values, you will be diagnosed with gestational diabetes. Diagnosis is important in order to manage gestational diabetes properly and help prevent complications to you and your baby.

If you have been diagnosed with gestational diabetes from this test and need management tools please sign up for my newsletter and receive FREE 3 dinner meal recipes for gestational diabetes and my FREE gestational diabetes ebook.  Find the sign up form on this page!

3-hour gestational diabetes test

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My One Hour Glucose Tolerance Test Reading Was High

My One Hour Glucose Tolerance Test was High

Do I Have Gestational Diabetes?

Once you are suspected to have gestational diabetes, you will be subjected to an oral glucose tolerance test to determine whether or not you really have gestational diabetes. For most women who are going to undergo this test, this can be nerve-racking as they do not know what to expect. Hence, it is very important to educate yourself regarding the glucose tolerance test so that you know the preparation, the procedure, and the normal values for the test results. This will also prevent you from subjecting yourself to undue stress that might adversely affect your baby.

What is the one hour glucose tolerance test?

The oral glucose tolerance test, also known as the one-hour glucose challenge test, is administered between weeks 24 and 28 of your pregnancy. This test will initially determine whether or not you are at risk for developing gestational diabetes. The results of this test are not conclusive, for a high value is still subject to a confirmatory test, the three-hour glucose tolerance test. A high value in this test means that you indeed have gestational diabetes.

How do I prepare for the one hour glucose tolerance test?

For the one-hour glucose tolerance test, there is no preparation required. You can take it right there and then since no fasting is needed. However, if you are going to undergo the three-hour glucose tolerance test, you need to fast for 10 to 14 hours before the test. You should also refrain from drinking or eating anything during the three-hour duration of the test.

What happens in the one hour glucose tolerance test?

one hour glucose tolerance testIn the one-hour oral glucose tolerance test, you will be asked to drink a sugary beverage that contains 50 grams of glucose. After finishing the drink, your doctor will wait for one hour before testing your blood glucose levels. During this one hour, you cannot eat or drink anything. After one hour, your doctor will extract a blood sample from you and compare your values with that of the normal range. If your blood sugar level is less than 130 mg/dl, this means that you do not have gestational diabetes and you will not be subjected to any more tests. However, once the value exceeds 130 mg/dl, you might have gestational diabetes, but the doctor needs to make sure first. Hence, you will be subjected to the three-hour glucose tolerance test. This means that the results of the one-hour glucose tolerance test only determine the possibility of having gestational diabetes, but they do not establish the fact that you really have gestational diabetes.

Once you are subjected to the three-hour glucose tolerance test, your doctor will first draw a blood sample after your 14-hour fasting. Next, you will be asked to drink a sugary liquid containing 100 grams of glucose, then have your blood samples taken one, two, and three hours after finishing the drink. This means that your blood sample will be taken for a total of four times. The normal values for this test should be 95 mg/dl for your fasting blood sugar, 180 mg/dl after one hour, 155 mg/dl for two hours, and 140 mg/dl for three hours. Any two values exceeding this range confirm your condition of gestational diabetes.

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If you believe you will eventually be diagnosed with gestational diabetes due to your one hour glucose tolerance test then please consider buying my book on meal planning for gestational diabetes from the trusted source below Amazon…