Patch testing with substances not included in the standard series

Abstract
During a 5-yr period, 3664 consecutive patients were patch tested in a private dermatology practice with Standard Series of the International Contact Dermatitis Research Group (ICDRG). Of these 454 were tested with one or more additional substances which were suspected of having caused their dermatitis. Of the 454 patients, 194 had positive reaction to one or more of the additional substances. Most of these reactions were of current relevance, and in only 25% of the patients could the allergies have been predicted by the use of the Standard Series alone. In .apprx. 50% of the patients, the reactions to additional substances could be traced to occupational sources.

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