What substances are tested in the standard “screening” patch test? Because of its convenience, most patients with a suspected allergic contact dermatitis are patch tested with the True Test “standard” panel of 28 allergens, which can detect many common sensitivities (Table 9-3). However, this panel only detects 62% to 75% of the most common allergens. The North American Contact Dermatitis Group’s Standard 65- allergen tray, which utilizes the Finn Chamber method, is a more efficacious screening series than more limited patch test series. Additional testing with more specialized allergen panels is frequently warranted to enhance allergen detection. Testing should only be done with known materials in accepted concentrations. Cohen DE, Rao S, Brancaccio RR: Use of the North American Contact Dermatitis Group standard 65-allergen series alone in the evaluation of allergic contact dermatitis: a series of 794 patients, Dermatitis 19:137–141, 2008. James WD, Rosenthal LE, Brancaccio RR, Marks JG Jr: American Academy of Dermatology Patch Test Survey: use and effectiveness of this procedure, J Am Acad Dermatol 26:991–994, 1992.
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