ALERT

For the latest coronavirus care instructions and resources, please call our COVID-19 hotline at 208-381-9500. Find additional information and resources here and learn more about how we’re working to keep you healthy and safe.

toggle mobile menu Menu
toggle search menu

Site Navigation

Supplemental

Menu

Chorionic villus sampling (CVS)

Chorionic villus sampling (CVS)

Chorionic villus sampling (CVS) is a test done during early pregnancy that can find certain problems with an unborn baby (fetus). It may be done when either parent has a family history of an inherited genetic condition or when the mother wants to find out her chances of having a baby with a chromosome problem.

Chorionic villi are tiny finger-shaped projections found in the placenta. The genetic material in chorionic villus cells is the same as in fetal cells. During CVS, a sample of chorionic villus cells is taken and examined for chromosome problems, such as Down syndrome. The sample is usually collected by putting a thin flexible tube (catheter) through the vagina and cervix into the placenta (transcervical CVS). The sample can also be collected by putting a long, thin needle through the belly into the placenta (transabdominal CVS). Ultrasound is used to guide the catheter or needle into the correct position for collecting the sample.

CVS is usually done late in the first trimester, between the 10th and 13th weeks of pregnancy.

This information does not replace the advice of a doctor. Healthwise, Incorporated disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. Healthwise is a URAC accredited health web site content provider. Privacy Policy. How this information was developed to help you make better health decisions.

© 1995-2015 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.