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How does the fasting plasma glucose (FPG) test diagnose diabetes?

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The fasting plasma glucose (FPG) test is most reliable when done in the morning. If your fasting glucose level is 100 to 125 mg/dL, you have a form of prediabetes called impaired fasting glucose (IFG), meaning that you are more likely to develop type 2 diabetes but do not have it yet. A level of 126 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 1, 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 1, 2018

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

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