After10 weeks: First trimester screening can be done at 11-13 weeks. Definitive diagnosis by chromosome analysis can be done through cvs sampling after 10 weeks.
Answered 4/23/2016
6.3k views
Many tests: The answer to this question will not fit into such a small space so I refer you to the following comprehensive discussion of screening and diagnostic tests. http://www.mayoclinic.org/diseases-conditions/down-syndrome/basics/tests-diagnosis/con-20020948
Answered 9/23/2014
3.7k views
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