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Pilot evaluation of a convenient and cost-effective method of patch testing
Erin Warshaw1, An Liu, Kelly Jerstad
1Center for Chronic Disease Outcomes Research, Minneapolis VA Medical Center and the Department of Dermatology, University of Minnesota, Minneapolis, MN, USA.
Summary
Previously prepared stored patches show promise for detecting allergic contact reactions, similar to freshly prepared ones. Further research is needed to confirm these findings across various allergens and storage durations.
Area of Science:
- Dermatology
- Allergology
- Immunology
Background:
- Allergic contact dermatitis diagnosis relies on patch testing.
- Standard patch testing uses freshly prepared allergens.
- The stability and efficacy of stored allergens are not well-established.
Purpose of the Study:
- To compare the diagnostic efficacy of previously prepared stored allergen patches versus freshly prepared patches.
- To assess the reliability of stored patches in detecting allergic contact reactions.
Main Methods:
- A double-blind, randomized pilot study involving 71 patients.
- Application of two sets of 62 nonaqueous allergens (fresh vs. stored for ~6 weeks) to participants' backs.
- Comparison of reaction concordance and discordance between fresh and stored patch test results.
Main Results:
- Overall concordance of reactions between fresh and stored patches was 63%.
- No statistically significant difference in positive reaction rates was observed between fresh and stored patches in cases of complete discordance.
- Pilot data indicates stored patches are comparable to fresh ones for detecting most allergic contact reactions.
Conclusions:
- Stored allergen patches may be a viable alternative to fresh preparations for diagnosing allergic contact dermatitis.
- Larger studies are recommended to investigate antigen-specific efficacy and the impact of varied storage durations on patch test results.