Peritoneal fluid analysis is a laboratory test to examine fluid that has collected in in the area of the abdomen that contains the gastrointestinal organs. This area is called the peritoneal space.

The test is performed to determine the cause of fluid in the abdomen, to detect whether injury has caused internal bleeding, and to detect peritonitis.

It is also done to remove large amounts of fluid from the peritoneal space in people who have liver disease.

The sample of fluid is removed from the periotoneal space using a needle and syringe.

The health care provider will clean and numb a small area of your belly area (abdomen). Next, the doctor inserts a needle through the skin of your abdomen, and into the peritoneal space, and withdraws a sample of fluid. The fluid collects into a tube (syringe) attached to the end of the needle.

See: Abdominal tap

The fluid is sent to a laboratory where it is examined. Tests will be done on the fluid to measure red and white blood cell counts, protein, and albumin, and to check for bacteria and fungi. Occasionally, tests for glucose, amylase, ammonia, alkaline phosphatase, LDH, cytology, and other substances are done.

Let your health care provider know if you have any allergies to medications or numbing medicine, are taking any medications (including herbal remedies), have any bleeding problems, or might be pregnant.

You may feel a stinging sensation from the numbing medicine, or pressure as the needle is inserted.

If a large amount of fluid is withdrawn, you may have dizziness or lightheadedness. Tell the health care provider if you feel dizzy.