Lumbar Puncture/Spinal Tap
A lumbar puncture is a procedure performed to obtain a sample of the cerebral spinal fluid (CSF). CSF can be used to diagnose infections as well as cancer.
In some situations, a lumbar puncture is performed to administer chemotherapy into the spinal fluid.
Preparation
There is no preparation for this test but you will be asked to sign a consent form.
Procedure
For testing, you will either be asked to lie on your side with your knees pulled up to your chest and chin tucked downward, or to sit up but bent over. A small area over your lower spine will then be cleansed and injected with a numbing medicine (anesthetic). The anesthetic may sting or burn when first injected.
A needle is then inserted and the fluid is collected. You may experience a pressure sensation when the needle is inserted but this is usually brief.
The needle is then removed and a bandage is placed over the needle site.
You will need to lay flat for 30-60 minutes following the procedure to avoid developing a headache.
Overall, the procedure is associated with little discomfort and takes approximately 30 minutes to perform.