Reproducibility of Patch Test Results: Comparison of TRUE Test and Finn Chamber Test
For evaluation of reproducibility duplicate patch test series comprising 12 allergens were applied to either side of the back in a total of 139 patients. The reproducibility of a newly developed patch test system, the TRUE Test, was compared with that of the Finn chamber test. In the TRUE Test 20 of 63 patients had at least one positive reaction, the total number of positive reactions being 28. Five of these 28 reactions (17.9%) were found on only one side of the back, i.e. they were nonreproducible. In the Finn chamber test 33 of 76 patients had at least one positive reaction, and 22 of 58 positive reactions (37.9%) were nonreproducible. The percentage of nonreproducible positive results was more than twice as high in the Finn chamber test as in the TRUE Test. However, due to the low number this difference in reproducibility between the two test systems was not statistically significant using the chi-square test (P = 0.1).
Key wordsPatch test Reproducibility False-positive reactions False-negative reactions TRUE Test Finn chamber test
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