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Ency. home > Test > A > Abdominal tap - paracentesis

Abdominal tap - paracentesis    See images

Overview | Risks | Results

Alternative names:

Peritoneal tap; Paracentesis

Definition:

The abdomen (peritoneal cavity) usually contains minimal fluid. In certain conditions, fluid can accumulate in the abdomen. The abdominal tap is a procedure in which a needle is inserted through the abdominal wall to obtain a sample of any fluid that is present. The sample is then sent to the laboratory for analysis.

How the Test is Performed

This test may be done in an office, treatment room, or the hospital. The puncture site will be cleansed and shaved if necessary. You then receive a local anesthetic.

The tap needle is inserted 1 to 2 inches into the abdomen. Sometimes a small incision is made to help insert the needle.

The sample of fluid is then withdrawn into a syringe. The needle is removed, and a dressing is applied to the puncture site. If an incision was made, 1 or 2 stitches are used to close it.

How to Prepare for the Test

Inform your health care provider if you have any allergies to medications or anesthetic, are taking any medications, have any bleeding problems, or might be pregnant.

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:

How the Test will Feel

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 If a large amount of fluid is withdrawn, you may experience dizziness or lightheadedness.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

Why the Test is Performed

The laboratory analysis will help determine why fluid is present in the abdomen. The test is frequently performed to check for internal bleeding.

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