photo-patch test

pho·to-·patch test

a test of contact photosensitization: after application of a patch with the suspected sensitizer for 48 hours to two sites, if there is no reaction, one area is exposed to a weak erythema dose of sunlight or ultraviolet light; if positive, a more severe reaction with vesiculation develops at the exposed patch area than the nonexposed skin patch site.

pho·to-patch test

(fō'tō pach test)
A test of contact photosensitization: After application of a patch with the suspected sensitizer for 48 hours to two sites, if there is no reaction, one area is exposed to a weak erythema dose of sunlight or ultraviolet light; if positive, a more severe reaction with vesiculation develops at the exposed patch area than the nonexposed skin patch site.

pho·to-patch test

(fō'tō pach test)
A test of contact photosensitization: After application of a patch with the suspected sensitizer for 48 hours to two sites, if there is no reaction, one area is exposed to a weak erythema dose of sunlight or ultraviolet light; if positive, a more severe reaction with vesiculation develops at the exposed patch area than the nonexposed skin patch site.
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Photo-patch tests provide one or more positive allergen responses in 75% of cases, the significance of which remains unclear.