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Delayed patch test reactions at days 7 and 9.

A W Macfarlane·R K Curley·R M Graham·M S Lewis-Jones·C M King
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Abstract

403 consecutive patients were examined on days 2, 4, 7, and 9 following application of patch tests. Late positive reactions, i.e., those which manifested after day 4, were seen in 29 patients (7.2%). The allergens which most commonly produced late positive reactions were neomycin (7), potassium dichromate (4), and cobalt (3). Paired patch test readings on days 4 and 7 were more reliable than those on days 2 and 4. If only 1 patch test reading were performed, a single reading on day 4 would have been most useful. The reading on day 9 proved to be of limited value. Of 11 patients who were retested after an interval of more than 6 months, 7 showed earlier eliciting reactions, which may have been due to active sensitization.

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Dermatitis, ContactHumansPatch TestsTime FactorsJournal Article

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BibTeXRIS

A W Macfarlane, R K Curley, R M Graham, M S Lewis-Jones, C M King. 1989. Delayed patch test reactions at days 7 and 9.. https://doi.org/10.1111/j.1600-0536.1989.tb03121.x

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