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1. en.wikipedia.org › wiki › Down_syndromeDown syndrome - Wikipedia

   en.wikipedia.org › wiki › Down_syndrome

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   8 hours ago · An example of an algorithm for determining the indication for prenatal genetic testing of Down syndrome [122] The risk from the procedure is greater the earlier it is performed, thus amniocentesis is not recommended before 15 weeks gestational age and chorionic villus sampling before 10 weeks gestational age.

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