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Photo-patch test

photo-patch test pho·to-patch test (fō’tō-pāch’)
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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  • Photoperceptive

    photoperceptive pho·to·per·cep·tive (fō’tō-pər-sěp’tĭv) adj. Capable of receiving and perceiving light.

  • Photoperiod

    [foh-tuh-peer-ee-uh d] /ˌfoʊ təˈpɪər i əd/ noun, Biology. 1. the interval in a 24-hour during which a plant or animal is exposed to light. /ˌfəʊtəʊˈpɪərɪəd/ noun 1. the period of daylight in every 24 hours, esp in relation to its effects on plants and animals See also photoperiodism photoperiod pho·to·pe·ri·od (fō’tō-pĭr’ē-əd) n. The duration of […]

  • Photoperiodicity

    [foh-tuh-peer-ee-uh-diz-uh m] /ˌfoʊ təˈpɪər i əˌdɪz əm/ noun, Biology. 1. the response, as affecting growth or reproduction, of an organism to the length of exposure to light in a 24-hour period. /ˌfəʊtəʊˈpɪərɪəˌdɪzəm/ noun 1. the response of plants and animals by behaviour, growth, etc, to photoperiods n. 1920, from photoperiod (1920, from photo- + period) […]

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