Glucose Tolerance Test (GTT) or Oral Glucose Tolerance Test OGTT

October 7, 2011

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The glucose tolerance test is a diagnostic test for gestational diabetes. You will be asked to fast overnight. When you arrive at your health care provider for testing you will be given a very strong glucose solution with 100 grams of glucose to drink.

Your blood will be drawn 4 times. The first time is before you drink the glucose solution, and then at 1, 2, and 3 hour intervals after you drink the glucose solution.

For each blood draw there is a cutoff level that indicates a high glucose level. If you have two ore more high values on your blood draws then you will be diagnosed as having gestational diabetes.

About 15 percent of women receiving the glucose challenge test will have an abnormal result. Of these women, 15 percent will be found to have gestational diabetes.

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