Peritoneal fluid analysis
Key points
- This is a test to examine fluid that has accumulated in the peritoneal space (the abdominal space that houses the gastrointestinal organs).
- The physicians will sterilize and then numb a small area of your abdomen with a small needle.
- Immediately before the abdominal tap, empty your bladder.
- The preparation a parent can provide for this or any test or procedure depends on the child's age, interests, previous experiences, and level of trust.
Definition
This is a test to examine fluid that has accumulated in the peritoneal space (the abdominal space that houses the gastrointestinal organs). The sample is obtained by an abdominal tap.
How the test is performed
A sample of fluid is obtained by abdominal tap. The physicians will sterilize and then numb a small area of your abdomen with a small needle. Next, a larger needle will be inserted into the peritoneal space and the fluid will be withdrawn.
Occasionally, vacuum bottles are used to draw off large amounts of fluid. The fluid is typically examined in the laboratory for appearance, red and white blood cell counts, protein and albumin, bacteria and fungi. Occasionally tests for glucose, amylase, ammonia, alkaline phosphatase, LDH, cytology, and other substances are performed.
How to prepare for the test
You must sign a consent form. Immediately before the abdominal tap, empty your bladder.
For infants and children:
The preparation a parent can provide for this or any test or procedure depends on the child's age, interests, previous experiences, 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)
- School age test or procedure preparation (6 to 12 years)
- Adolescent test or procedure preparation (12 to 18 years)
How the test will feel
There may be a stinging sensation from the anesthetic and 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 If a large amount of fluid is withdrawn, you may have a feeling of dizziness or light-headedness. Tell the health care provider if you become dizzy.
Why the test is performed
The test is performed to determine the cause of fluid in the abdomen, to detect whether trauma has caused internal bleeding, to detect a hole in the bladder, and to detect peritonitis.
Written and revised by
Gerald Hurowitz, M.D.
Our doctors write and review articles for accuracy and keep them up to date.
health.am provides general information, not medical advice. Always consult a qualified health professional about your own health.