Potentially allergic substances that form the battery in patch tests may interfere with positivity to other substances.
To avoid false-positive results, substances with a tendency to cross-reaction or co-sensitising should be tested when well apart, say dermatologists at São Paulo Medical School, Brazil. The dermatologists described epicutaneous patch tests as a practical and objective way of diagnosing allergic contact dermatitis.
However, good results depended on how patches were applied. Two hundred patients were study to determine if the substances which formed the test battery interfered with the patch test result.
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