Chorionic Villus Sampling (CVS)

Explanation

Chorionic villus sampling, or CVS, is a diagnostic test that examines a small sample of placental tissue during pregnancy.

What does CVS test?

CVS collects a small sample of tissue from the placenta, the organ that supports the pregnancy. The sample can be examined for specified chromosome or gene conditions. Unlike a screening blood test, CVS is a diagnostic test for the conditions included in the analysis.

What are the limits of the result?

A normal result applies only to the conditions tested and cannot guarantee that every health condition is absent. A result can sometimes be inconclusive because the sample does not provide enough clear information. Further testing may then be needed. The sampling procedure also has risks that should be discussed with the care team.

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