A fluid called peritoneal fluid serves as lubrication in the abdominal cavity. It is situated between the layers of peritoneum that line the abdominal wall in tiny amounts (about 5    Ã¢‚¬Å¡Ã¢‚¬Å¡20 mL). In order to decrease friction and moisturise the organs exteriors during movement and digesting, peritoneal fluid is used. Numerous ailments and disorders can result in peritoneal inflammation (peritonitis) and/or an excessive buildup of peritoneal fluid (peritoneal effusion or ascites). A series of tests called peritoneal fluid analysis assess this fluid to ascertain the reason for the excess fluid.