Having a Lumbar Puncture

A lumbar puncture (spinal tap) may be used to help diagnose certain problems in your brain or spinal cord. Prepare for your test as instructed. From start to finish, your procedure will take about 30–60 minutes.

During the Test

You will lie on your side with your knees drawn into your chest (fetal position). Or, you may be asked to sit bent forward, with your chin down. Your low back will be wiped with a special cleanser. It will then be injected with a numbing medication. The doctor will insert a sterile needle into the sac that contains the spinal fluid. You may feel some pain or pressure. Try to remain still. And be sure to do as you're asked. Some spinal fluid will be withdrawn. A small bandage will then be placed over the puncture site. You may be asked to lie still briefly before you leave.

After the Test

When you're able to leave, be sure to have someone drive you home. Lie down flat in bed or take it easy, as advised by the doctor. And drink plenty of water. If you get a headache, lie down flat. You may also want to take an over-the-counter pain reliever. The day after your lumbar puncture, you can remove your bandage. Your doctor will tell you when the results of your lumbar puncture are ready.