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A 36-year-old woman who received no prenatal care gave birth to a full-term 3200-g (7.1-lb) girl by spontaneous vaginal delivery. The delivery was uncomplicated. The mother denies any long-term comorbidity. However, she admits to occasional use of alcohol in social situations. The infant’s physical examination is notable for a flat nasal bridge, upslanting palpebral fissures, prominent epicanthal folds, and a pansystolic murmur. Karyotype analysis reveals an abnormality.
In utero, the infant’s condition could have been predicted by which of the following results on a triple marker screen?
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