How long do you apply patch testing before interpreting the results?
The TRUE test recommends 48 hours, but anywhere from 2-5 days is seen with other allergists/dermatologists, especially with more comprehensive testing.
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How long do you apply patch testing before interpreting the results?
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Dermatology · University of Pennsylvania
Answered on
In most instances, patches are removed after 48 hours (2 days). This timeframe is specifically chosen to allow sufficient time for the allergen to penetrate the stratum corneum and trigger a T-cell-mediated response, while simultaneously reducing the potential for significant skin irritation that ca...
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