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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.).
3. While the majority of couples who find out the sex of their baby find out through ultrasound, there are other tests that can do the job as well. Tests like amniocentesis or CVS can both determine a babyâs gender, but they are not without risk, as there is a small chance they could cause a miscarriage. Not everyone gets these tests, but for those who do, CVS is typically done between 11 and 12 weeks and amniocentesis between 16 and 22 weeks.