Intradermal Skin Test

Allergy test close-up
Intradermal skin testing involves the injection of an allergen extract under the skin to raise a "bubble" under the skin, which is then "read" after 15-20 minutes, with a positive reaction resulting in a raised, red, itchy bump.. sisu/Getty Images

Definition: An intradermal skin test is a method of allergy skin testing that involves the injection of a small amount of allergen under the skin, resulting in a raised bump (wheal) and redness (flare) within a few minutes if allergic antibodies specific to that allergen are present in the skin.

Intradermal skin testing can identify more people with allergies than a scratch test, although may also lead to false positive results.

Also Known As: ID skin test, intracutaneous skin test

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