Medical Definition of Glucose tolerance test

  • Medical Author:
    William C. Shiel Jr., MD, FACP, FACR

    Dr. Shiel received a Bachelor of Science degree with honors from the University of Notre Dame. There he was involved in research in radiation biology and received the Huisking Scholarship. After graduating from St. Louis University School of Medicine, he completed his Internal Medicine residency and Rheumatology fellowship at the University of California, Irvine. He is board-certified in Internal Medicine and Rheumatology.

Glucose tolerance test: A test of carbohydrate metabolism that is used primarily in the diagnosis of type II diabetes and gestational diabetes. Abbreviated GTT. After the patient has fasted overnight, but before breakfast, a specific amount of glucose is given by mouth, and the blood levels of this sugar are measured at intervals. The GTT result depends on a number of factors, including the ability of the intestines to absorb glucose, the power of the liver to take up and store glucose, the capacity of the pancreas to produce insulin, and the amount of 'active' insulin.

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Reviewed on 12/13/2018

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