Comparison of Nickel Sulfate 2.5% and Nickel Sulfate 5% for Detecting Nickel Contact Allergy

Comparison of Nickel Sulfate 2.5% and Nickel Sulfate 5% for Detecting Nickel Contact Allergy Background Nickel is among the most common contact allergens found on patch testing worldwide and, because of its ubiquitous nature in our environment, often has important implications for allergen avoidance strategies. In both North America and Europe, nickel positivity is found in approximately 20% of patients who undergo patch testing. Whereas in North America, nickel sulfate is typically tested at a concentration of 2.5%, in Europe, it is tested at a 5% concentration. Objective The primary objective was to assess the differences in patch test positivity to nickel sulfate 2.5% and 5%. Methods We investigated 205 consecutive patients between September 2017 and February 2018 who were tested to nickel sulfate at concentrations of both 2.5% and 5%. Results Among the 205 patients tested, 33% were positive (+, ++, or +++) to at least 1 concentration of nickel sulfate, 20% were positive to nickel sulfate 2.5%, and 31% were positive to nickel sulfate 5% (χ21(N = 205) = 16.1, P = 0.0001). Patients were 6.5 times more likely to have a positive reaction to nickel sulfate 5% than 2.5% (odds ratio 95% confidence interval, 2.3–25.6). Conclusions Given our findings, we propose an additional evaluation of nickel sulfate 5% as a standard allergen for patch testing in North America. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Dermatitis Wolters Kluwer Health

Comparison of Nickel Sulfate 2.5% and Nickel Sulfate 5% for Detecting Nickel Contact Allergy

Dermatitis, Volume 29 (6) – Jan 1, 2018

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Publisher
Wolters Kluwer Health
Copyright
© 2018 American Contact Dermatitis Society. All Rights Reserved.
ISSN
1710-3568
eISSN
2162-5220
D.O.I.
10.1097/DER.0000000000000419
Publisher site
See Article on Publisher Site

Abstract

Background Nickel is among the most common contact allergens found on patch testing worldwide and, because of its ubiquitous nature in our environment, often has important implications for allergen avoidance strategies. In both North America and Europe, nickel positivity is found in approximately 20% of patients who undergo patch testing. Whereas in North America, nickel sulfate is typically tested at a concentration of 2.5%, in Europe, it is tested at a 5% concentration. Objective The primary objective was to assess the differences in patch test positivity to nickel sulfate 2.5% and 5%. Methods We investigated 205 consecutive patients between September 2017 and February 2018 who were tested to nickel sulfate at concentrations of both 2.5% and 5%. Results Among the 205 patients tested, 33% were positive (+, ++, or +++) to at least 1 concentration of nickel sulfate, 20% were positive to nickel sulfate 2.5%, and 31% were positive to nickel sulfate 5% (χ21(N = 205) = 16.1, P = 0.0001). Patients were 6.5 times more likely to have a positive reaction to nickel sulfate 5% than 2.5% (odds ratio 95% confidence interval, 2.3–25.6). Conclusions Given our findings, we propose an additional evaluation of nickel sulfate 5% as a standard allergen for patch testing in North America.

Journal

DermatitisWolters Kluwer Health

Published: Jan 1, 2018

References

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