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photo-patch test

[ fō′tō-păch ]
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n.
A test for contact photosensitization in which a patch containing the suspected sensitizer is applied to the skin for 48 hours; if there is no reaction, the area is exposed to a reddening dose of ultraviolet light; if the reaction is then positive, a more severe reaction develops at the patch site than in surrounding skin.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

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