Peritoneal fluid culture
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Peritoneal fluid culture

Definition

Peritoneal fluid culture is a laboratory test performed on a sample of peritoneal fluid to detect bacteria or fungi that cause infection (peritonitis).

Peritoneal fluid is the fluid from the peritoneal cavity, a space between the wall of the abdomen and the organs inside.

Alternative Names

Culture - peritoneal fluid

How the Test is Performed

A sample of peritoneal fluid is needed. For information on how this is done see: Abdominal tap (paracentesis)

.A sample of fluid is sent to the laboratory for Gram stain and culture. The sample is checked to see if bacteria grows.

How to Prepare for the Test

Empty your bladder before your abdominal tap procedure.

How the Test Will Feel

A small area in your lower abdomen will be cleaned with germ-killing medicine (antiseptic). You will also receive local anesthesia. You will feel pressure as the needle is inserted. If a large amount of fluid is withdrawn, you may feel dizzy or lightheaded.

Why the Test is Performed

The test is done to find out if there is an infection in the peritoneal space.

Normal Results

Peritoneal fluid is a sterile fluid, so normally no bacteria or fungi are present.

What Abnormal Results Mean

The growth of any microorganism, such as bacteria or fungi, from peritoneal fluid is abnormal and indicates peritonitis.

Risks

There is a small risk of the needle puncturing the bowel, bladder, or a blood vessel in the abdomen. This may result in bowel perforation, bleeding, and infection.

Considerations

The diagnosis of peritonitis is based on more than just the peritoneal fluid culture (which may be negative even if you have peritonitis).

References

 

Garcia-Tsao G. Cirrhosis and its sequelae.In: Goldman L, Schafer AI, eds.Cecil Medicine. 24th ed.Philadelphia,PA: Saunders Elsevier; 2011:chap 156.

Runyon BA. Ascites and spontaneous bacterial peritonitis.In: Feldman M, Friedman LS, Brandt LJ, eds.Sleisenger & Fordtran's Gastrointestinal and Liver Disease. 9th ed.Philadelphia,Pa: Saunders Elsevier; 2010:chap 91.


Review Date: 11/9/2011
Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. George F. Longstreth, MD, Department of Gastroenterology, Kaiser Permanente Medical Care Program, San Diego, California. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
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