Oral Glucose Tolerance Test

Glucose Challenge Test, Glucose Tolerance Test, OGTT (Oral Glucose Tolerance Test)

Why It Is Done

The oral glucose tolerance test (OGTT) is done to:

• Check pregnant women for gestational diabetes. When done for this purpose, the test is called a glucose challenge screening test, and it is usually done during the 24th to the 28th week of pregnancy. You have an increased chance of developing gestational diabetes if you:
  • Have had gestational diabetes during a previous pregnancy.
  • Have previously given birth to a baby who weighed more than 4 kg (8.8 lb).
  • Are younger than age 25 and were overweight before getting pregnant.
• Confirm the presence of gestational diabetes if other blood glucose measurements are high.
• Screen women who have polycystic ovary syndrome (PCOS) for diabetes.
• Diagnose prediabetes and diabetes.

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Author:	Caroline Rea, RN, BS, MS	Last Updated: September 14, 2007
Medical Review:	Caroline S. Rhoads, MD - Internal Medicine Alan C. Dalkin, MD - Endocrinology Andrew Swan, MD, CCFP, FCFP - Family Medicine
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