What does the Glucose Tolerance Test (GTT) diagnose?

The Glucose Tolerance Test (GTT) is primarily used to diagnose diabetes, specifically to assess how well the body processes glucose. During the test, a patient consumes a glucose solution, and their blood glucose levels are measured at various intervals afterward. If the blood glucose levels remain elevated beyond a certain threshold, it indicates impaired insulin response, which is characteristic of diabetes, particularly gestational diabetes or type 2 diabetes.

The other options relate to different health conditions: anemia is related to the deficiency of red blood cells or hemoglobin; hyperlipidemia pertains to elevated levels of lipids in the blood; and thyroid disorders involve dysfunction of the thyroid gland. Each of these conditions has its own specific diagnostic tests, distinct from the methodology and purpose of the GTT, which focuses specifically on glucose metabolism and regulation.