What is the purpose of a paracentesis?

Remove excess fluid. It is a bedside procedure in which excess fluid is removed from the abdominal cavity (ascites). The purpose is to relieve pressure on the abdominal contents & upward pressure on the lungs/diaphragm as well as correct internal fluid balance. Ascites can be caused by many things but the most common is liver disease. Samples of the fluid is sent to the lab for analysis and to rule out infection.