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Health A-Z

Medical Content Created by the Faculty of the
Harvard Medical School

How Do I Prepare?

You will need to sign a consent form, which is generally required when the procedure is done outside of an emergency situation. Tell your doctor ahead of time if you have ever had an allergic reaction to lidocaine or the numbing medicine used at the dentist's office.

Doctors routinely do a physical examination and in some cases order a CT scan of the brain before recommending a lumbar puncture. The CT scan is performed when doctors suspect a medical problem that could put you at risk for movement of the brain during the procedure, a very rare but serious complication.

From Health A-Z, Harvard Health Publications. Copyright 2007 by the President and Fellows of Harvard College. All rights reserved. Written permission is required to reproduce, in any manner, in whole or in part, the material contained herein. To make a reprint request, contact Harvard Health Publications. Used with permission of StayWell.

You can find more great health information on the Harvard Health Publications website.