How is use of paracenthesis in acute abdomen?

● We draw fluid from inside the peritoneum using a needle. It’s rarely used, and usually done in the left iliac fossa at Rovsing’s point. ● In normal people, there are 20-50 cc of fluid in the peritoneum, and this fluid's role is lubrication to prevent friction in the intestine. ● This exam is done in case there's suspicion of perforation, hemorrhage, bile fistula... ● We get a +ve parancethesis if we get bile or blood mixed with the fluid. ● This exam is rarely done nowadays.