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Learn MoreA lumbar puncture is a common medical procedure sometimes used in the diagnosis of childhood cancer. It is also called an “LP” or a “spinal tap.”
During the procedure, a doctor, nurse practitioner, or other qualified medical professional removes a small sample of fluid from around the spine using a thin needle.
The fluid is called cerebrospinal fluid or CSF. It surrounds and protects the brain and spinal cord. Testing the CSF can show if the patient has a disease or infection. The body makes CSF constantly. The patient’s body quickly replaces the small amount removed during the lumbar puncture.
The patient will either lie on his or her side or sit on the side of a bed.
The health care provider will feel for the right spot to insert the needle.
Once the needle is inserted, it will take 10 minutes or less to collect fluid.
Testing cerebrospinal fluid can show if the patient has a disease or infection.
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Reviewed: June 2018