Used in research settings to measure diamine oxidase (DAO) enzyme levels in biological samples, particularly in studies related to histamine metabolism. Helps investigate conditions linked to histamine intolerance, such as migraines, digestive disorders, and allergic-like reactions. The kit enables quantification of DAO activity in serum, plasma, or tissue extracts, supporting clinical and biochemical research into gut health, inflammatory responses, and metabolic enzyme function. Commonly applied in immunology and gastroenterology studies to assess intestinal mucosal integrity, as DAO is primarily produced in the intestinal epithelium. Also used in pharmaceutical research to evaluate drug effects on histamine regulation.