scratch test

scratch test (skrch)

n.

A test for allergy performed by scratching the skin and applying an allergen to the wound.

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scratch test,

n a skin test for identifying an allergen, performed by placing a small quantity of a solution containing a suspected allergen on a lightly scratched area of the skin. If a wheal forms within 15 minutes, allergy to the substance is indicated.

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scratch test

a test for hypersensitivity in which a minute amount of the substance in question is inserted in small scratches made in the skin. A positive reaction is swelling and reddening at the site within 30 minutes. Used in allergy testing and in testing for tuberculosis. In animals, intradermal testing is used more commonly. See also skin test.