What test is typically used to check for gestational diabetes at 24-28 weeks of gestation?

• A. Fasting blood glucose test
• B. Glucose challenge test
• C. Hemoglobin A1C test
• D. Insulin sensitivity test

Answer: (B)

The glucose challenge test is the standard screening method used to check for gestational diabetes between 24 to 28 weeks of gestation. During this test, a pregnant woman consumes a sugary drink containing a specified amount of glucose. After a set period, typically one hour, her blood is tested to see how her body handles the glucose. If the initial results are elevated, a follow-up diagnostic test, usually a three-hour glucose tolerance test, is conducted to confirm the diagnosis.

This approach is preferred during pregnancy because it is a routine screening and is less invasive and simpler than other methods. The glucose challenge test is designed to identify women who may be at risk for gestational diabetes without requiring fasting beforehand, making it more practical for use in a typical prenatal visit.

In contrast, the fasting blood glucose test requires the individual to fast prior to testing, which is not ideal for routine screening in pregnant women. The Hemoglobin A1C test assesses long-term blood glucose levels rather than immediate post-glucose load response, and it's typically not used for gestational diabetes screening. The insulin sensitivity test is more complex and not commonly employed as a primary screening method for gestational diabetes during pregnancy.