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Review Question - QID 210914

In scope icon M 7 C
QID 210914 (Type "210914" in App Search)
A 34-year-old gravida 2 para 1 woman at 16 weeks gestation presents for prenatal care. Her prenatal course has been uncomplicated. She takes no medications besides her prenatal vitamin which she takes every day, and she has been compliant with routine prenatal care. She has a 7-year-old daughter who is healthy. The results of her recent quadruple screen are listed below:

AFP: Low
hCG: Low
Estriol: Low
Inhibin-A: Normal

Which of the following is the most appropriate next step to confirm the diagnosis?