![]() ![]() Your doctor may need to move to another area of your spine if it is hard to get to the spinal fluid. If not, the stylet will be put back in and the needle will be moved in a little farther or at a different angle to get to the fluid. If the needle is in the right spot in the spinal canal, a small amount of cerebrospinal fluid (CSF) will drip from the end of the needle. When the needle is in place, the solid central core of the needle (stylet) is removed. Then a long, thin needle is put in the spinal canal. A numbing medicine (local anesthetic) is put in the skin. The area is cleaned with a special soap and draped with sterile towels. Your doctor marks your lower back (lumbar area) with a pen where the puncture will occur. If fluoroscopy is used, you will lie on your stomach so the fluoroscopy machine can take pictures of your spine during the procedure. These positions help widen the spaces between the bones of the lower spine so that the needle can be inserted more easily. ![]() Or you may sit on the edge of a chair or bed and lean forward over a table with your head and chest bent toward your knees. You will lie on a bed on your side with your knees pulled up toward your chest. If the pressure is high, you may need other tests before the spinal tap. The doctor also may look into your eyes using a special lighted scope (ophthalmoscope) to see if the pressure is high. You will empty your bladder before the procedure. It may also be done in the radiology department if fluoroscopy is used. A spinal tap may be done in your doctor's office, in an emergency room, or at your bedside in the hospital. ![]()
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