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A group of first-year medical students at Emory is pondering the question in a class led by Cecelia Bellcross. The genetics counselor has seen a scenario play out repeatedly, in which women with a positive screening result are told that their baby has DS. In fact, Bellcross tells the students, most women who receive positive results under current screening tests will not have babies with chromosomal abnormalities. Plus, according to the nIH, most babies with chromosomal abnormalities such as DS are born to women younger than 35.

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