The 3 hour OGTT is a diagnostic test for
gestational diabetes. It measures glucose concentrations over three hours after a
100-g oral glucose load. The test is done in the morning after an overnight fast of between 8 and 14 hours, and after at least 3 days of unrestricted diet (≥150 g carbohydrate per day) and
At least two or more values must be
equaled or exceeded for a positive diagnosis.
These values represent the equivalent
glucose oxidase plasma values calculated from the original data using the Somogyi-Nelson technique
1. *Guidelines for Care, California Diabetes and Pregnancy
2. American Diabetes Association.Diagnosis and classification of diabetes
mellitus. Diabetes Care. 2009 Jan;32 Suppl 1:S62-7 PMID:19118289 3. O’Sullivan JB, Mahan CM. Criteria for the oral glucose tolerance test in pregnancy. Diabetes 13:278-85, 1964 PMID: 14166677 4. Carpenter MW, Coustan DR: Criteria for screening tests for gestational diabetes. Am J Obstet Gynecol 144:768-73, 1982.PMID: 7148898 5. Sacks DA, Abu-Fadil S, Greenspoon JS, Fotheringham N: Do the current standards for glucose tolerance testing represent a valid conversion of O’Sullivan’s original criteria? Am J Obstet Gynecol 161:638-41, 1989.