Diagnostic Lumbar Puncture (Spinal Tap)

Overview

This is a way to get a sample of your cerebrospinal fluid (which we call "CSF"). That's the fluid that flows around your brain, spinal cord and spinal nerves. Testing this fluid will show signs of bleeding, infection or other problems.

Preparation

To begin, you sit or lie on your side and bend forward to expose your lower back. The doctor gives you an injection to numb your skin.

Taking the Sample

Then, the doctor inserts a needle into your back. It's carefully pushed between two vertebral bones and into the dural sac (that's the sheath that protects your nerve roots). The needle won't come near your spinal cord, because your spinal cord ends at a level above where the needle is placed. Cerebrospinal fluid will slowly drip out of the needle. The doctor collects it in vials for study.

End of Procedure

When it's done, the needle is removed and your back is bandaged. Some people get a headache after the procedure. You may be asked to lie down for a short time to reduce your chance of getting one.

Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.