You'll likely go to an outpatient medical center or a hospital for the lumbar puncture. You may be given a hospital gown to wear during the procedure.
During the test
You either lie on your side with your knees pulled up to your chest or you sit on a stable surface and lean forward. In these positions, the spaces between your vertebrae widen. This makes it easier to insert the needle for removing spinal fluid. A health care professional washes your back with antiseptic soap or iodine to sterilize the area. A surgical drape covers the area.
You're given an injection of a local anesthetic to numb your lower back. You'll likely feel a pinch when the anesthetic is injected. A thin, hollow needle is inserted between the two lower vertebrae to the spinal canal. You may feel pressure in your back as the needle is inserted.
Once the needle is in place, you may be asked to change your position. Then a small amount of spinal fluid is withdrawn through the needle for testing. After the needle is removed, a health care professional applies pressure to the area to prevent bleeding. The area is covered with a bandage. The procedure takes about 45 minutes.
After the test
After the lumbar puncture, you may be asked to lie on your back or side for a few hours. This may help you avoid developing a headache. It's a good idea to rest for the remainder of the day. If you have questions, ask your health care professional about when you can return to usual activities.
If you develop a headache or back pain, your health care professional may recommend taking a pain reliever available without a prescription, such as acetaminophen (Tylenol, others). If your headache is very bad, contact your health care professional.