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Chorionic Villi Sampling (CVS) What is chorionic villi sampling Chorionic Villi Sampling (CVS) is
a test that gives a complete picture of the genetic makeup of the developing
foetus. This procedure involves taking a sample of the chorion, a
membrane surrounding the foetus, either via the vagina and cervix, or through
a needle inserted in the abdominal wall. Since the sample is taken directly
from the foetus, its examination can help in identifying any defects in
the baby.
Which diseases can be identified with CVS CVS is useful in detecting disorders
like Tay-Sachs, sickle-cell anaemia, most types of cystic fibrosis, the
thalassaemias, and Down's syndrome.
What are the advantages of CVS over amniocentesis The advantage of CVS over amniocentesis is that it can be performed as early as the tenth week of pregnancy and gives results within one or two weeks. Thus, doctors can identify genetic defects earlier on in the pregnancy. Amniocentesis can only be conducted around the 16th week of pregnancy. The results of CVS are also available earlier and sometimes, CVS can be performed when there is not enough amniotic fluid.
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