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Chorionic Villus Sampling (CVS)
Chorionic Villus Sampling is usually performed at very early stages of pregnancy, generally around the 8th to 13th week of pregnancy. During the CVS procedure, a catheter is inserted through the cervix and a small sample is taken from the outside of the gestational sack by gentle suction. This sampling procedure allows the obstetrician to obtain a small amount of fetal chorionic villi (trophoblastic tissue) which is used for the paternity test. Paternity tests conducted using CVS samples are just as accurate as tests which are performed after the child is born.