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CVS is usually performed between 10 and 13 weeks from your last menstrual period. CVS may be chosen over amniocentesis because it may be performed earlier in the pregnancy. Chorionic villus sampling detects chromosome abnormalities (i.e. Down syndrome) and genetic disorders (i.e. cystic fibrosis.).
Ijust had a CVS done 3 hours ago--not what specific answer you are looking for-but the test was easy to do-I had it done cervically and it took about 2 minutes to perform--it wasn't terribly painful-a little uncomforatble but not terrible--if you have any other specific questions please let me know--good luck to you!!