If a 3-hour G.T.T is ordered, what amount of glucose load should be given?

In a 3-hour glucose tolerance test (GTT), the standard glucose load administered is typically 100 grams. This amount is used to assess how well the body manages glucose over an extended period, providing important information regarding insulin response and potential abnormalities in glucose metabolism.

Choosing 100 grams ensures that the assessment aligns with established guidelines for diagnosing conditions such as diabetes mellitus or impaired glucose tolerance. The body’s response to this glucose load is then monitored through blood glucose measurements taken at designated intervals during the test.

The other glucose load options, while they may be relevant in different testing contexts, do not align with the standard for a 3-hour GTT. For example, the 50-gram load is usually associated with a 1-hour GTT, while the 75-gram load is more common in a 2-hour test. Therefore, selecting 100 grams is the correct approach for a 3-hour GTT to obtain accurate results for evaluating glucose tolerance.