Used in research settings to measure diamine oxidase (DAO) levels in rat biological samples such as serum, plasma, or tissue homogenates. This ELISA kit enables quantification of DAO activity, which is critical for studying histamine metabolism, as DAO is responsible for breaking down extracellular histamine. It is commonly applied in immunological and inflammatory research, especially in models related to allergic responses, gastrointestinal disorders, and mast cell activation. The assay helps evaluate DAO expression under various experimental conditions, supporting studies on gut health, food intolerance, and systemic inflammation in rodent models. Due to its specificity and sensitivity, this kit is a valuable tool for preclinical research in pharmacology and physiology.