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Rattus norvegicus skin extract is a non-standardized allergenic product derived from the skin of the brown rat (*Rattus norvegicus*). Developed and manufactured by Greer Laboratories, it is primarily used as a diagnostic tool in allergy testing to identify hypersensitivity to rat allergens. This is particularly relevant for laboratory workers, veterinarians, or individuals with environmental exposure. The extract is administered via percutaneous (skin prick), intradermal, or subcutaneous routes. It works by eliciting a localized IgE-mediated allergic response (type I hypersensitivity) in sensitized individuals, allowing for the clinical assessment of rat-specific allergies.
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