CVS Testing or Chorionic villus sampling is a test done during weeks 10-13 to determine genetic abnormalities such as Down syndrome.
The test is done by taking a sample of the chorionic villi, or finger-like projections on the placenta.
CVS can determine –
Almost all genetic abnormalities such as Down syndrome, trisomy 13, trisomy 18, and sex chromosome abnormalities (such as Turner syndrome and Klinefelter syndrome). The test is more than 99 percent accurate in diagnosing these conditions.
Several hundred genetic disorders, such as cystic fibrosis, sickle cell disease, and Tay-Sachs disease. The test is not used to look for all of them, but if your baby is at increased risk for one or more of these disorders, CVS can usually tell you whether your baby has the disease.
CVS is performed by passing a catheter through the cervix and placental tissue is obtained for evaluation of chromosomes.
**There’s a 1 percent chance of complications such as miscarriage
Information provided by East Cooper Prenatal Screening and Diagnosis and ACOG.org