Allergen

Patch testing

Patch test

Allergic contact dermatitis

Contact dermatitis

Allergy

Immunology

Medicine

Dermatology

Dermatitis

Patch testing is the most important diagnostic tool for the assessment of allergic contact dermatitis.This study documents the North American Contact Dermatitis Group (NACDG) patch testing results from January 1, 2013, to December 31, 2014.At 13 centers in North America, patients were tested in a standardized manner with a screening series of 70 allergens. Data were manually verified and entered into a central database. Descriptive frequencies were calculated, and trends were analyzed using χ test.A total of 4871 patients were tested. There were 3255 patients (66.8%) who had at least 1 positive reaction and 2412 patients (49.5%) who were ultimately determined to have a primary diagnosis of allergic contact dermatitis. A total of 434 patients (8.9%) had occupationally related skin disease. There were 9726 positive allergic reactions. Compared with the previous reporting periods (2011-2012 and 2001-2012, including at least three 2-year cycles), positive reaction rates for the top 25 screening allergens statisti...

North American Contact Dermatitis Group Patch Test Results 2013–2014