A pregnant patient at 28 weeks asks about gestational diabetes screening. When should screening occur?

• A. Between 24 and 28 weeks gestation.
• B. At first prenatal visit.
• C. After delivery.
• D. After 30 weeks.

Answer: (A)

Gestational diabetes screening is timed to catch glucose intolerance that tends to develop as insulin resistance rises in the second trimester. The standard window to screen is between 24 and 28 weeks of pregnancy. Testing within this period allows early detection and management to reduce risks to both mother and baby. Some women with high risk factors may be screened earlier, but universal screening typically occurs in this mid-pregnancy window. If screening is positive, a follow-up diagnostic test confirms gestational diabetes. So, this timing—between 24 and 28 weeks—is the appropriate window for screening.