Both chorionic villus sampling and amniocentesis collect fetal cell samples from the pregnant mother. However, during amniocentesis, a needle is passed through the abdomen and uterine walls to collect the samples; and during chorionic villus sampling, a suction tube is inserted through the vagina into the uterus to collect the samples.
Chorionic villus sampling (CVS) is a prenatal test in which a sample of chorionic villi is taken from the placenta for testing. This is done by taking a sample from the cervix (transcervical) or the abdominal wall (transabdominal). Amniocentesis is a process in which amniotic fluid is extracted from the uterus and then testing or treatment. This is the fluid that surrounds the fetus in a pregnant woman. Amniotic fluid is a clear, pale yellow fluid. It protects the fetus from injury and also against infection.
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