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- Negative: No abnormal skin reactions are noted
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- The results are read at 48 hours
and again at 72 hours to seven days, as prescribed. A
positive reaction is when there are any red, raised,
pruritic area of skin where a particular allergen was
placed
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- Concurrent dermatitis from another source
- Exposure of the patch site to water or excessive perspiration
- Inaccurate interpretation of the results
- Inaccurate timing for the reading of results
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