CVS Test

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CVS stands for Chorionic Villus Sampling, a prenatal test done to detect chromosomal abnormalities or genetic disorders in a fetus, such as Down syndrome. In this test, a doctor takes a sample of cells from the chorionic villi of the placenta to send to the lab for analysis.
Compared to amniocentesis, which also detects genetic abnormalities in women who are at risk for carrying chromosomal problems, CVS offers the advantage of being able to test early in pregnancy (10 to 12 weeks). Amniocentesis is usually done on the 16th week of pregnancy. Both tests involve an invasive procedure, which carries some risk of abortion or miscarriage.

What Problems does CVS Test Detect?
A CVS test detects chromosomal abnormalities like Down syndrome and other genetic disorders like cystic fibrosis. Unlike amniocentesis, it does not test for defects in the neural tube.
CVS can also be used for paternity testing before delivery of the baby. The potential father's DNA is collected and this is compared to the baby's DNA, which is collected by CVS. The test is 99% accurate in determining paternity.

What Are the Risks of CVS Test?
Risks of CVS include:
Miscarriage. One out of 100 CVS procedures may lead to a miscarriage, which is more likely to occur when CVS is done transcervical rather than transabdominal. Miscarriage is also more likely to occur if the baby is small for gestational age.
Rh sensitization. CVS may cause the baby's blood to enter the mother's bloodstream. To prevent a blood reaction if the mother's blood is Rh negative, Rh immunoglobulin is injected to the mother, thus avoiding antibody production.
Infection. Although rare, CVS may trigger an infection in the uterus.
Defects in the baby. This is possible only when CVS is done before...

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Watch a video to learn more on CVS Prenatal Test:
A CVS test is sometimes done during early pregnancy to determine if a fetus has a chromosomal abnormality, such as Down syndrome. One should consult a specialist to know more about the procedure and its risks and complications.

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