Used for measuring D-amino acid oxidase (DAO) activity in rat biological samples such as serum, plasma, or tissue homogenates. This ELISA kit enables researchers to quantify DAO levels in studies related to neurological function, histamine metabolism, and gut health. It is commonly applied in preclinical research to assess intestinal barrier integrity and immune responses, as DAO is primarily expressed in the intestinal mucosa and serves as a biomarker for enterocyte damage. The assay supports investigation into gastrointestinal diseases, food allergies, and inflammatory conditions in rat models. High sensitivity and specificity allow for accurate detection of small changes in DAO activity, making it a valuable tool in pharmacological and toxicological studies.