A 19-year-old woman, G 2, P 1, has a screening ultrasound at 20 weeks’ gestation that shows no abnormalities. However, premature labor leads to an emergent vaginal delivery at 31 weeks. Soon after birth, the neonate develops respiratory distress requiring intubation with positive pressure ventilation. Which of the following prenatal diagnostic tests could have best predicted this neonate’s respiratory distress?
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