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Digestive system
Digestive system


Peritoneal sample
Peritoneal sample


Definition:

An abdominal tap is a procedure used to remove fluid from the abdomen.



Alternative Names:

Peritoneal tap; Paracentesis



How the test is performed:

This test may be done in an office setting, treatment room, or hospital.

The puncture site will be cleaned and shaved, if necessary. You then receive a local numbing medicine. The tap needle is inserted 1 - 2 inches into the abdomen. Sometimes a small cut is made to help insert the needle. The fluid is pulled out into a syringe.

The needle is removed. A dressing is placed on the puncture site. If a cut was made, one or two stitches may be used to close it.

There are two kinds of abdominal taps:

  • Diagnostic tap -- a small amount of fluid is taken and sent to the laboratory for testing
  • Large volume tap -- several liters may be removed to relieve abdominal pain and fluid buildup


How to prepare for the test:

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
  • Might be pregnant

Infants and children:

The preparation you can provide for this test depends on your child's age, previous experience, and level of trust. For general information regarding how you can prepare your child, see the following topics:



How the test will feel:

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

If a large amount of fluid is taken out, you may feel dizzy or light-headed. Tell the health care provider if you feel dizzy.



Why the test is performed:

Normally, the abdomen contains only a small amount of fluid. In certain conditions, large amounts of fluid can build up in the abdomen.

An abdominal tap may be done to diagnose the cause of fluid build-up. It may also be done to diagnose infected abdominal fluid, or to remove a large amount of fluid to reduce abdominal pain.



Normal Values:

Normally, there should be little or no fluid in the abdomen.



What abnormal results mean:

An examination of abdominal fluid may show:



What the risks are:

There is a slight chance of the needle puncturing the bowel, bladder, or a blood vessel in the abdomen. If a large quantity of fluid is removed, there is a slight risk of lowered blood pressure and kidney failure. There is also a slight chance of infection.



Special considerations:




Review Date: 8/22/2008
Reviewed By: Christian Stone, MD, Division of Gastroenterology, Washington University in St. Louis School of Medicine, St. Louis, MO.Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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Wentworth-Douglass Hospital
789 Central Avenue, Dover, NH 03820
Phone: (603) 742-5252
Toll free: 1 (877) 201-7100