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Definition
By Mayo Clinic staffThe glucose tolerance test, also known as the oral glucose tolerance test, measures your body's response to sugar (glucose). The glucose tolerance test can be used to screen for type 2 diabetes. More commonly, a modified version of the glucose tolerance test is used to diagnose gestational diabetes — a type of diabetes that develops only during pregnancy.
The glucose tolerance test is done in several steps. First your fasting blood sugar level is measured, and then you drink a sugary solution. This is followed by one or more blood tests over the course of two to three hours.
