Let your doctor know immediately if you develop a severe reaction at the site of injection, fever, or difficulty breathing. You will be asked to return to the test center in two or three days to be examined by a nurse or physician. Results available when 3 days. If you are allergic to the tested substance, redness and swelling will appear within 24 to 72 hours at the site of the injection. It's easy to perform.
Disadvantages Discomfort at the site of the test.
Recent viral infection or vaccination, particularly against measles, or a weakened immune system may also produce a false-negative result. Adapted from The Patient's Guide to Medical Tests by Faculty Members at The Yale University School of Medicine. Copyright 1997 by Yale University School of Medicine and G.S. Sharpe Communications, Inc. Published by Houghton Mifflin Company. No part of this database may be reproduced or otherwise used without prior written permission from the publisher unless such use is expressly permitted by applicable law.