There are two types of skin tests. During the first type of skin test, a drop of a suspected allergen is pricked or scratched on the surface of the skin. The test is performed on the back or forearm. Many suspected allergens are tested at the same time, including regional pollens, animal dander, foods, and others. If you are allergic to one of the tests, you will have redness and swelling at the test spot.
A second type of test is sometimes recommended. In this type, a small amount of the suspected allergen is injected into the skin of the arm or forearm. Again, several suspected allergens are tested at the same time, and the postitive result is very similar to the first type, including redness and swelling at the test spot.
How long does it take to get skin test results?
Skin testing is fast. For both types of skin tests, positive reactions usually appear within 15 minutes.
Is skin testing painful?
Both types of skin tests have little or no pain. However, positive reactions cause annoying itching red bumps which look and feel like mosquito bites. The itching and bumps are gone usually in just a few short minutes or hours.
Does medicine interfere with allergy skin tests?
Some medicines do interfere with allergy skin tests. It is important that antihistamines be stopped 48 hours prior to your visit. Most asthma medications (including inhalers) should be continued as instructed. Please contact us with any questions regarding medications.
The contents of this page are for informational purposes only. It is not intended to replace evaluation by a physician. If you have questions or medical concerns, please contact your allergist/immunologist.