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A patch test relies on the principle of a type IV hypersensitivity reaction.. The first step in becoming allergic is sensitization. When skin is exposed to an allergen, the antigen-presenting cells (APCs) – also known as Langerhans cell or Dermal Dendritic Cell – phagocytize the substance, break it down to smaller components and present them on their surface bound major histocompatibility ...
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Chronic and/or intermittent rashes which are not readily explained by history and physical exam often will benefit from further testing. Patch test. A patch test (contact delayed hypersensitivity allergy test) [17] is a commonly used examination to determine the exact cause of an allergic contact dermatitis. According to the American Academy of ...
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It is well-known that patch testing can cause irritative local reactions. It is generally agreed that LTT based tests like MELISA are better suited for diagnosing implant-related metals sensitivity than patch testing as the relationship between skin hypersensitivity and systemic hypersensitivity (Ständer, et al., 2017) is ill-defined.
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