Someone here please explain the difference between chorionic villus sampling and amniocentesis?

Placenta vs fluid. Cvs can usually be done earlier and involves obtaining placental tissue for chromosome analysis. This is done by needle biopsy either through the cervix or abdomen. Amniocentesis is obtaining amniotic fluid for testing also by needle aspiration. Both are done with ultrasound guidance, cvs slightly riskier with bleeding & cramping, both safe to do, both done by mfm docs. I hope that helps.
CVS and Amnio. A cvs is done earlier in pregnancy and involves getting tissue from the placenta. An amniocentesis is done later in pregnancy. It involves getting amniotic fluid from the gestational sac. Chromosomal abnormalities can be found by both techniques. An amniocentesis can also check for neural tube defects. A genetic disease, such as cystic fibrosis can be diagnosed by either technique.

Related Questions

Chorionic villus sampling vs amniocentesis risk?

Risk. Risk of pregnancy loss with cvs and amniocentesis are equivalent. That's been shown by four different studies. In experienced hands the loss rate is something like 1 in 1600. Read more...

Which of the two tests are better? Or are recommended? Amniocentesis or cvs (chorionic villus sampling)? No past history of any health problems.

It depends. CVS is generally thought to have a slightly higher miscarriage rate than amniocentesis, but this may not be the case everywhere. For mor e information check this link: http://www.babycenter.com/0_chorionic-villus-sampling-cvs_328.bc?page=4#articlesection8. Read more...

What are amniocentesis, chorionic villus sampling and blood/saliva test screening used for? Abortions?

Prenatal diagnosis. Cvs and amniocentesis are used to discover chromosomal abnormalities in the fetus. They are also used to diagnose genetic diseases, such as cystic fibrosis, that some people are at risk for. Blood and saliva screening tests are used to find out if parents are at risk for a baby with certain genetic diseases. Read more...
Is it a boy or girl? Amniocentesis and chorionic villus sampling are used mainly for testing to determine the sex of your unborn child. Blood/saliva testing is used for so many other conditions they can't begin to begin to be listed here. Read more...

Which specific doctors perform a chorionic villus sampling test?

MFMs. Your obstetrician would refer you to a maternal-fetal medicine specialist (perinatologist) or you may have one already if a prior pregnancy or other circumstances caused your current pregnancy to be high risk. Read more...

What types of doctors perform a chorionic villus sampling test? Fellows?

MFMs. Maternal fetal medicine specialists usually perform cvs, although there are occasional doctors of other specialties who have been trained to do the procedure. Fellows, who are still in training, may perform the procedure under the supervision of the doctor who is teaching them. Read more...

Do I have to see a specialist to get a chorionic villus sampling cvs ordered?

No. Your obgyn can order it for you by sending you to a specialist who does the procedure. Read more...
YES!! You need a specialist, a maternal-fetal expert, also called a perinatologist to do this. Your OB can order it, but you need a specialist with experience & skills to minimize risks to your fetus. Read more...

At what stage is chorionic villus sampling done?

10-12 weeks. Chorionic villus sampling (cvs) obtains cells from the fetoplacenta for testing at 10-12 weeks of pregnancy, amniocentesis obtains fetal skin/urine cells at 16-18 weeks. Higher risks for miscarriage (2-3% for cvs, <0.5% or negligible for amnio) balance against the cvs advantage of testing before a women "shows, " preserving the privacy of pregnancy (testing). Read more...

How, when is chorionic villus sampling performed?

First trimester. Cvs can be performed as early as 9 to 12 weeks of gestation - compared to amniocentesis that is usually done at 1bout 15 weeks. Read more...