Glucose tolerance testing (GTT) is used to evaluate the ability to regulate glucose metabolism and is indicated when random/fasting blood glucose testing alone is insufficient in establishing or ruling out the diagnosis of diabetes mellitus.

Why GTT test is done?

The glucose tolerance test identifies abnormalities in the way your body handles glucose after a meal — often before your fasting blood glucose level becomes abnormal.

Why GTT is done in pregnancy?

What is a glucose tolerance test? A Glucose Tolerance Test (GTT) is a blood test that is used to diagnose gestational diabetes which can develop during pregnancy. The test measures your body's ability to maintain a normal blood glucose (sugar) level.