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Why is it not possible to test for contact dermatitis with a blood sample?

April 26, 2017blood contact dermatitis possible sample Test

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Why is it not possible to test for contact dermatitis with a blood sample?

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Contact dermatitis is not mediated by antibodies but by lymphocytes. Instead a patch-test with a panel of suspected antigens can be used. It is put on the back of the patient for 48 hours and the reactions are finally read after 72 hours. (This type of reaction is also called delayed hypersensitivity).