Chorionic Villus Sampling (CVS) Test
Chorionic villus sampling (CVS) is a genetic test done during pregnancy to check if your baby has certain chromosome or genetic disorders. It uses cells from the placenta and is very accurate.
What this test measures
CVS measures the chromosomes in chorionic villus cells from the placenta to detect abnormalities such as extra, missing, or damaged chromosomes that can cause serious health problems.
What your results mean
Reference ranges vary by laboratory and by your age and sex. MedlinePlus does not publish a single normal range for this test — always read your result against the range printed on your own lab report and discuss it with your provider.
Frequently asked questions
What is chorionic villus sampling (CVS)?
CVS is a genetic test done during pregnancy that checks cells from the placenta to see if your baby has certain health conditions.
What conditions can CVS detect?
CVS can detect chromosome problems like Down syndrome, Trisomy 18, and genetic diseases like cystic fibrosis, sickle cell disease, and Tay-Sachs disease.
When is CVS performed?
CVS is performed between the 10th and 13th week of pregnancy.
How accurate is CVS?
CVS is very accurate and is a diagnostic test, meaning it can almost always tell for sure whether a baby has a chromosome disorder.
What does a normal CVS result mean?
A normal result means it is unlikely your baby has the disorder tested, but it does not guarantee your baby won't have any health problems.
Related lab tests
Sources
- MedlinePlus: Chorionic Villus Sampling (CVS) — NIH MedlinePlus
Last updated . Information is aggregated from official public sources and is not a substitute for professional medical care.