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How does the oral glucose tolerance test (OGTT) diagnose diabetes?

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You need to fast at least 8 hours before the test. Your plasma glucose is measured immediately before and 2 hours after you drink a liquid with 75 grams of glucose dissolved in water. If your blood sugar level is between 140 and 199 mg/dL 2 hours after drinking the liquid, it means you're more likely to develop type 2 diabetes but do not have it yet. A 2-hour glucose level of 200 mg/dL or above, confirmed by repeating the test on another day, means that you have diabetes.

From: Diagnosis of Diabetes WebMD Medical Reference

SOURCES: American Diabetes Association. National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health. News release, FDA.

Reviewed by Michael Dansinger on November 01, 2018

SOURCES: American Diabetes Association. National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health. News release, FDA.

Reviewed by Michael Dansinger on November 01, 2018

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How does a random blood glucose level test help diagnose diabetes?

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