Congenital and Inherited Disorders practice

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A woman has an amniocentesis at 17 weeks after a cell-free DNA test reported a high chance of trisomy 21. She is booked to fly interstate in three days for a family funeral and is extremely anxious. She asks whether anything at all can be known before she leaves. The sample is adequate and uncontaminated. Which one of the following tests on the amniotic fluid will give her a reliable answer about trisomy 21 most quickly?