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Brasch, J. et al.

Brasch, Henseler, Aberer, Fuchs, Hoeck, Kreilgård,

Patch testing of nickel sulfate and potassium dichromate with a standardized ready-to-use test system gives highly reproducible results: a double-blind multicentre study.

There is still some doubt about the reproducibility of patch tests. A sound assessment needs optimized and unbiased studies. This study analysed the results of a double-blind multicentre study with nickel sulfate and potassium dichromate patch tests attached synchronously to both sides of the back of patients with a history of nickel allergy, conducted with a highly standardized randomized test system (TRUE-test). Out of 589 patients tested, a total of 388 had responded with allergic reactions to nickel sulfate and 130 to potassium dichromate. The reproducibility of positive nickel (dichromate) patch tests was 99.2% (90.8%). The reaction index was also calculated, which relates the number of allergic reactions obtained with a test preparation to the number of questionable and irritant reactions; the reaction index can range from -1 (questionable and irritant reactions only occur) to 1 (allergic reactions only occur). For nickel sulfate the reaction index was 0.91, but it was only 0.23 for potassium dichromate, as a result of considerably more questionable reactions. In conclusion, a highly synchronous reproducibility of results can be achieved by using a well-standardized patch-test system, especially with nickel sulfate. However, distinct allergens and test systems need to be evaluated separately.[1]

References

Patch testing of nickel sulfate and potassium dichromate with a standardized ready-to-use test system gives highly reproducible results: a double-blind multicentre study. Brasch, J., Henseler, T., Aberer, W., Fuchs, T., Hoeck, U., Kreilgård, B. Acta Derm. Venereol. (2001) [Pubmed]

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