What is a spinal tap (lumbar puncture)?
A
spinal tap, also called a
lumbar puncture, is a procedure used to obtain
spinal fluid. The withdrawn spinal fluid is tested for
infection (meningitis)
or, occasionally, used to evaluate the cells, protein,
or pressure of the spinal fluid.
When is a spinal tap used?
A
spinal tap is used when there is concern about
diseases or infections involving the brain.
How is a spinal tap performed?
The patient is positioned lying on their side or sitting
up in bed. The doctor uses a numbing medicine (local
anesthetic) on the lower part the back and then
carefully inserts a needle into the
spinal canal, which contains the
spinal fluid. Approximately two teaspoons of spinal
fluid are obtained and tested.
Does a spinal tap hurt?
When the needle is inserted the patient may sense some
temporary discomfort or feel light pain that travels
down one of the legs.
Are there any potential
complications associated with a spinal tap?
The most common
side effect of a
spinal tap is headache. Other complications of a
spinal tap are rare.
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Spinal Tap (Lumbar Puncture) 
