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January 1966

Open Versus Closed Patch Testing With Oleoresins

Author Affiliations


From the Department of Dermatology, Northwestern University Medical School, Chicago.

Arch Dermatol. 1966;93(1):47-48. doi:10.1001/archderm.1966.01600190053009

Comparison of open and closed patch tests with oleoresins was done on a group of patients with active dermatitis venenata. Equalization of positive reactions from open and closed patch tests occurred during the interval between the initial reading and subsequent observation. If epidermal sensitivity was slight, only a positive closed patch test occurred. This accounted for the difference (13%) between the open and closed patchtest results reported in this study.