Health Tests

Medical Content Created by the Faculty of the
Harvard Medical School


How Do I Prepare?

If you take blood thinners, aspirin or NSAIDs, you might have to stop using them for several days before the test to avoid bleeding complications. If you've had an allergic reaction to lidocaine or a similar local anesthetic, let your doctor know this before having the test.

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.

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