Peritoneal fluid analysis

How the test is performed:

A sample of fluid is obtained by abdominal tap. The fluid is examined in the laboratory for appearance, red and white blood cell counts, protein, glucose, amylase, ammonia, alkaline phosphatase, LDH, cytology, bacteria, fungi, and possibly other substances.

How to prepare for the test:

You must sign a consent form. Immediately before the abdominal tap, empty your bladder.

Infants and children:
The physical and psychological preparation you can provide for this or any test or procedure depends on your child's age, interests, previous experience, and level of trust. For specific information regarding how you can prepare your child, see the following topics as they correspond to your child's age:

• infant test or procedure preparation (birth to 1 year)
• toddler test or procedure preparation (1 to 3 years)
• preschooler test or procedure preparation (3 to 6 years)
• schoolage test or procedure preparation (6 to 12 years)
• adolescent test or procedure preparation (12 to 18 years)

How the test will feel:

There is a stinging sensation from the anesthetic. There will be a feeling of pressure as the needle is inserted. If a large amount of fluid is withdrawn, you may have a feeling of dizziness or lightheadedness. Tell the health care provider if you become dizzy.

Why the test is performed:

The test is performed to determine the cause of fluid (ascites) in the abdomen, to detect trauma, to detect perforation (hole) of the bladder, to detect peritonitis, or to detect peritoneal effusion.