Health Tests

Medical Content Created by the Faculty of the
Harvard Medical School


How Do I Prepare?

Don't take antihistamines for three days before the test, because they can interfere with the results by preventing you from reacting to a substance you would normally be allergic to. Tell your doctor if you have ever had anaphylaxis, a life threatening allergic reaction, or if you have had a serious reaction to a previous allergy 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.

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