Following the 2012 ADA guidelines, the times of measurement for plasma glucose levels during an OGTT in nonpregnant patients are

Following the 2012 ADA guidelines, the times of measurement for plasma glucose levels during an OGTT in nonpregnant patients are

• A. Fasting, 1 hour, and 2 hours
• B. Fasting and 60 minutes
• C. 30, 60, 90, and 120 minutes
• D. Fasting, 30, 60, 90, and 120 minutes

Answer: (A)

In nonpregnant adults, the oral glucose tolerance test is performed after an overnight fast and uses two measurement points: fasting plasma glucose and the glucose level at 2 hours after consuming a 75 g glucose load. The 2-hour measurement is essential because it captures how well the body clears glucose over the full two-hour period, which is what determines diabetes or impaired glucose tolerance according to the ADA criteria. The 1-hour time point is not part of the ADA diagnostic protocol for nonpregnant individuals; it is used in testing for gestational diabetes, not here. So the standard protocol relies on fasting and a 2-hour measurement, not an intermediate 1-hour reading.

In nonpregnant adults, the oral glucose tolerance test is performed after an overnight fast and uses two measurement points: fasting plasma glucose and the glucose level at 2 hours after consuming a 75 g glucose load. The 2-hour measurement is essential because it captures how well the body clears glucose over the full two-hour period, which is what determines diabetes or impaired glucose tolerance according to the ADA criteria. The 1-hour time point is not part of the ADA diagnostic protocol for nonpregnant individuals; it is used in testing for gestational diabetes, not here. So the standard protocol relies on fasting and a 2-hour measurement, not an intermediate 1-hour reading.