First Trimester of Pregnancy — CVS Prenatal Test | Parents


So CVS is stands for chorionic villus sampling.
It is also a needle procedure like the amniocentesis, but it can be done earlier in pregnancy typically
9 to 14 weeks as the window of time when CVS is done. And it samples from cells from the
early placenta. If the couple is already decided they do want to have a more definitive diagnosis
and do invasive testing, they may opt to do CVS because you have the result sooner. CVS
and amniocentesis these days both test for chromosomes, but there’s also an array of
other disorders that can now be tested for and one of the hard part of the couple is
to decide in some cases is whether to do these expanded tests or not. Because those results
can be somewhat confusing in terms of what the information is. If they’re all negative,
you feel great. If some of these are positive, it may not quite sure in every case what that
really means for your baby. It does seem that in the most experienced hands, the risk for
CVS is probably the same as the risk for amniocentesis, but generally speaking the risk for CVS is
quoted to be a little bit higher than the risk for amniocentesis. Technically, it probably
relates to people who don’t want anymore amnios. Much like the amniocentesis, a needle is inserted
that is like drawing blood. It’s not so comfortable, but it’s typically brief and the patients
often tolerate it quite well. CVS is mostly done abdominally, although there are sometimes
depending on the location of the placenta sometimes. It may also be done vaginally and
so the needle is introduced under ultrasound guidance and the sample is taken from the
site of the early placenta. We often tell patients to expect — to wait somewhere in
the 10- to 14- day range. For chromosome analysis, results are 100 % accurate.

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