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Medicine/Medical. a test for suspected allergy by application to the skin of a patch impregnated with an allergen: allergic reaction is indicated by redness at the site of application.
(med) a test to detect an allergic reaction by applying small amounts of a suspected substance to the skin and then examining the area for signs of irritation

patch test n.
A test for allergic sensitivity in which a suspected allergen is applied to the skin on a small surgical pad for a period of time to determine if an allergic response is present.


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