How is glucose tolerance testing used to diagnose diabetes?

Glucose tolerance testing (GTT) measures how well the body processes glucose and is used to diagnose Diabetes and prediabetes. During the test, a patient fasts overnight, then consumes a glucose-rich drink, and blood sugar levels are measured at intervals. If blood sugar levels remain elevated beyond specific thresholds after two hours, it indicates impaired glucose metabolism, suggesting diabetes or prediabetes. This test helps healthcare providers assess insulin sensitivity and the body's ability to handle glucose effectively.