OGTT timing is typically performed in multiple time windows.

• A. It Is Performed in Multiple Time Windows
• B. It Is Performed Only Once
• C. It Is Performed Without Fasting
• D. It Does Not Involve Glucose Measurement

Answer: (A)

OGTT timing is about watching how glucose changes over time after a standardized glucose load, not just checking a single moment. After the patient fasts and drinks a fixed amount of glucose, blood samples are drawn at several set times—often at baseline, then at intervals such as 30, 60, and 120 minutes (and sometimes at 3 hours). This sequence creates a glucose curve that shows how quickly glucose rises and how well insulin lowers it. That dynamic picture is essential for diagnosing normal glucose tolerance, impaired fasting glucose, impaired glucose tolerance, or diabetes, which is why this test uses multiple time windows.

The other statements don’t fit: it’s not just done once; it requires fasting before the test; and measuring glucose is central to the OGTT.