During the oral glucose tolerance test your blood glucose is tested two hours after drinking 75 grams of glucose. You are diagnosed with diabetes if your blood glucose level is 200 mg/dl or greater.
Review Date 1/16/2018
Updated by: Brent Wisse, MD, Associate Professor of Medicine, Division of Metabolism, Endocrinology & Nutrition, University of Washington School of Medicine, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.