What is Allergy Testing?
A particular substance causes allergy reactions. Any substance that can trigger an allergic reaction is called an allergen. To find out what particular substance is causing your problem, your physician may suggest you undergo allergy evaluation by testing your skin or your blood.
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Along with scratch tests, intradermal tests are sometimes needed. This is more sensitive and identifies lower level allergies. A tiny amount of allergen is injected under your skin, usually on the forearms. This test might be done if your reaction to the scratch test cannot be clearly determined.