Specimen: Plasma
A glucose tolerance test (GTT) is a medical test that measures the body's ability to metabolize glucose, which is a type of sugar. The test involves drinking a sugary solution and then measuring blood sugar levels at specific time intervals. The most common type of GTT is the oral glucose tolerance test (OGTT), which is used to diagnose prediabetes, gestational diabetes, and type 2 diabetes. During the OGTT, the patient is asked to fast overnight and then drinks a sugary solution. Blood samples are taken before drinking the solution and then at specific time intervals afterward to measure blood sugar levels. The results of the test can help to diagnose diabetes and determine how well the body is able to process glucose. In some cases, a two-hour GTT may also be performed, which involves measuring blood sugar levels two hours after a meal. This test can help to diagnose reactive hypoglycemia, which is a condition in which blood sugar levels drop too low after a meal.
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