About 85 to 90%: The screening does no detect all cases of down's syndrome.
Answered 5/27/2012
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75-85% detection: Quadruple screening includes afp, unconjugated e3, beta-hcg, and inhibin-a. This screening test detects 75-85 % of fetuses with down syndrome, with false positive rate at 5%.
Answered 9/28/2016
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