Ms. Bacci is 10 weeks pregnant with her third pregnancy and reports that previous babies weighed over 10 pounds at birth. Which screening test would be most appropriate?

Ms. Bacci is 10 weeks pregnant with her third pregnancy and reports that previous babies weighed over 10 pounds at birth. Which screening test would be most appropriate?

• A. Amniocentesis
• B. Fasting blood glucose
• C. Maternal nutrition analysis
• D. Pelvimetry

Answer: (B)

The situation points to potential glucose intolerance contributing to fetal macrosomia. When a history of large birthweights is present, screening for diabetes in pregnancy becomes important to detect any hyperglycemia early and manage it to reduce complications. A fasting blood glucose test is the most appropriate screening because it can identify pre-existing diabetes or undiagnosed hyperglycemia early in pregnancy. If this screen is elevated, further diagnostic testing (like a glucose tolerance test) would follow to confirm diabetes and guide treatment. The other options don’t address glucose intolerance: amniocentesis screens for fetal genetic issues, not maternal diabetes; pelvimetry evaluates the size of the pelvis for labor, not metabolic risk; and maternal nutrition analysis, while important for overall health, isn’t a screening test for diabetes.

The situation points to potential glucose intolerance contributing to fetal macrosomia. When a history of large birthweights is present, screening for diabetes in pregnancy becomes important to detect any hyperglycemia early and manage it to reduce complications.

A fasting blood glucose test is the most appropriate screening because it can identify pre-existing diabetes or undiagnosed hyperglycemia early in pregnancy. If this screen is elevated, further diagnostic testing (like a glucose tolerance test) would follow to confirm diabetes and guide treatment.

The other options don’t address glucose intolerance: amniocentesis screens for fetal genetic issues, not maternal diabetes; pelvimetry evaluates the size of the pelvis for labor, not metabolic risk; and maternal nutrition analysis, while important for overall health, isn’t a screening test for diabetes.