DOI: 10.1373/clinchem.2013.212035


As part of routine prenatal care, the obstetrician of a 25-year-old gravida 1, para 0 woman performed fetal heart-rate monitoring at 22 weeks gestational age. The fetal heart rate was 90 bpm, below the expected range of 120–160 bpm. This finding prompted a subsequent fetal ultrasound and echocardiogram.