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Chorionic Villus Sampling (CVS)

Genetic Testing in Pregnancy


Updated June 03, 2014

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Why the test is done:

This test can be used to determine if your baby has a chromosomal disorder.

How the test is done:

A small needle/catheter is placed either through the abdomen or through the vagina near the uterus to collect a small sample of villi. Ultrasound is used to guide the needle/catheter away from the baby and the placenta.

When the test is done:

Genetic disorders testing can be done as early as 8 weeks.

How the results are given:

Depends on the results. Usually the genetic defect is identified or a normal baby is identified, including gender.

Risks involved:

There was a 3-5% miscarriage rate associated with this test, though recent studies are saying that the risk of CVS is more in line with the 1-2% from amniocentesis. This may vary by practitioner, mainly due to experience levels. There are also some studies that suggest that there may be a slight increase in the number of limb deformities from amniotic banding syndrome.



Where do you go from here?

Genetic disorders that are detected will be referred to the genetic counselor for further counseling and decision making.

Other Resources:

Related Video
How Does Chorionic Villus Sampling Work?
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  6. Genetic Testing - What is Chorionic Villus Sampling (CVS)?

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