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Patch test: A test to discover which allergen is responsible for contact dermatitis in a patient. It involves applying dilute samples of a variety of allergens to a patch on the back and observing the skins reaction.
Patch test: Skin tests in which the sensitizer is applied to a patch of cotton cloth or gauze held in place for approximately 48-72 hours. It is used for the elicitation of a contact hypersensitivity reaction.
Source: MeSH 2007
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