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Paracentesis (from Greek ÎºÎµÎ½ÏÎ¬Ï, to pierce) is a form of body fluid sampling procedure, generally referring to peritoneocentesis (also called laparocentesis) in which the peritoneal cavity is punctured by a needle to sample peritoneal fluid. 1  1 Indications. 2  2 Paracentesis for ascites.  3 Ascitic fluid analysis.
Amniocentesis is a procedure used to take out a small sample of the amniotic fluid for testing. This is the fluid that surrounds the fetus in a pregnant woman. Along with various enzymes, proteins, hormones, and other substances, the amniotic fluid contains cells shed by the fetus.