Final answer:
An oral Glucose Tolerance Test (GTT) is a medical test used to assess an individual's ability to tolerate glucose and detect diabetes mellitus.
Step-by-step explanation:
An oral Glucose Tolerance Test (GTT) is a medical test used to assess an individual's ability to tolerate glucose and detect diabetes mellitus. In this test, the patient consumes a glucose solution within a specified time frame and their blood glucose levels are measured at regular intervals. The test results are plotted on a graph to determine if the individual is normal, indicating they can tolerate glucose, or if they are diabetic, showing an intolerance to glucose.