Comparative multicenter studies with TRUE Test and Finn Chambers in eight Swedish hospitals. TRUE Test Study Group.

A multicenter study with the TRUE Test standard panel and the same allergens in petrolatum applied with the Finn Chamber technique indicated 167 positive reactions with both test methods. Thirty-eight positive reactions were indicated with TRUE Test alone and 28 positive reactions were indicated with the Finn Chamber method only. Irritant reactions were equally frequent with both tests. Quality, as scored by surface distribution and adherence of the tape, tended to be slightly better with TRUE Test. Less than 50% of the positive test results were predicted by history, whereas more than 75% of them had past or present relevance.