Used to measure diamine oxidase (DAO) enzyme activity in biological samples, this kit is essential in research related to histamine metabolism. It helps assess intestinal mucosal health, as DAO is primarily produced in the gut and reflects enterocyte function. Commonly applied in studies of food intolerance, inflammatory bowel disease, and histamine-related disorders. Also used in preclinical evaluation of drugs affecting gastrointestinal integrity. The assay enables quantitative analysis in serum, plasma, or tissue extracts, supporting both clinical research and pharmaceutical development.