24 and 48 h allergen exposure in patch testing
- 1 January 1984
- journal article
- research article
- Published by Wiley in Contact Dermatitis
- Vol. 10 (1), 25-29
- https://doi.org/10.1111/j.1600-0536.1984.tb00057.x
Abstract
Patch test reactions to 11 common contact allergens were studied after 24 h and 48 h occlusion with Finn Chambers in 390 patients. Concordant allergic results were found in 96 cases (74%). In 22 patients (17%), the reaction was positive only after 48 h and in 11 cases (8.5%) only after 24 h exposure. Most of the discordant reactions were to Ni, Co, neomycin, formaldehyde and perfume mix. Irritant reactions were found in 55 cases, the majority occurring after 48 h occlusion. NiCl2 tested in parallel with 48 h exposure led to more positive allergic and toxic reactions than NiSO4.Keywords
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