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What is chorionic villus sampling (CVS)?
Chorionic villus sampling (CVS) is a type of prenatal diagnostic test to
detect chromosomal problems that can result in
genetic diseases and birth
defects. It involves taking a small sample of part of the placenta (the
chorionic villi) where it is attached to the wall of the uterus.
CVS can diagnose chromosomal abnormalities that cause conditions like
sickle cell anemia, cystic fibrosis, and Tay Sachs disease. It does
not diagnose neural tube defects. Since the procedure examines genetic material,
it can tell you the gender of the fetus.
CVS is performed earlier in pregnancy than amniocentesis. It is done between
the 10th and 13th week of pregnancy (measured from your last menstrual period).
It is reported to be 98% to 99% accurate in detecting genetic abnormalities. CVS can
also be used to detect paternity and is 99% accurate in establishing paternity
of a fetus.