PMID: 9534892Apr 16, 1998Paper

Repeated open application tests (ROAT) in patients allergic to colophony--evaluated visually and with bioengineering techniques

Acta Dermato-venereologica
G Färm

Abstract

It is desirable to further evaluate the clinical relevance of a positive patch test. The repeated open application test (ROAT) has been suggested as such a supplementary method. To compare the results of patch testing with the outcome of ROATs, 13 colophony-sensitive subjects and 9 controls were patch-tested with colophony in a serial dilution test. Five microliters, of three concentrations of a colophony solution and the vehicle were then applied to small test areas on the lower arm, once daily for 2 weeks. Prior to each application, all test sites were examined visually and with bioengineering techniques. In the ROATs, 10/13 colophony-sensitive subjects--but no controls--reacted to a 20% colophony solution, 4 also 1%. A correlation was found between the threshold concentration at patch testing and the outcome of ROATs. There was great variation in the reactivity in the ROATs. Objective measures for evaluating the ROAT reactions gave no further information than visual assessment.

Citations

Jan 5, 2000·Contact Dermatitis·A M Downs, J E Sansom
Nov 7, 2008·Cutaneous and Ocular Toxicology·Danny Zaghi, Howard I Maibach
Dec 5, 2006·Journal of the American Academy of Dermatology·Daniel W ShawLawrence F Eichenfield
Oct 20, 2004·The British Journal of Dermatology·L Kynemund PedersenJ D Johansen
Oct 15, 2009·Contact Dermatitis·Louise Arup FischerJeanne Duus Johansen
Jul 20, 2007·The British Journal of Dermatology·L A FischerT Menné
Sep 8, 2004·Food and Chemical Toxicology : an International Journal Published for the British Industrial Biological Research Association·Clarissa D Villarama, Howard I Maibach
Jun 29, 2005·International Journal of Toxicology·UNKNOWN Cosmetic Ingredient Review Expert Panel

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