At which gestational weeks is a glucose test typically checked in pregnant women?

The glucose test in pregnant women, often referred to as the glucose challenge test or the oral glucose tolerance test, is typically conducted between 24 and 28 weeks of gestation. This screening is crucial for identifying gestational diabetes, a condition that can develop during pregnancy and affect both maternal and fetal health.

The timing of the test is based on the increased insulin resistance that typically occurs during the second trimester. By 24 weeks, the placenta has developed sufficiently to begin influencing maternal metabolism, making this an optimal time to assess the mother's glucose levels. Testing before this window, such as at 20-22 weeks, may miss cases of gestational diabetes, while testing at 30-32 weeks may come too late for effective management.

Therefore, the choice indicating the testing period of 25-28 weeks aligns perfectly with standard medical guidelines for screening gestational diabetes, making it the correct answer.