Used in biomedical research to measure peptide YY (PYY) levels in biological samples such as serum or plasma. Commonly applied in studies related to appetite regulation, gastrointestinal function, and metabolic disorders like obesity and diabetes. Enables researchers to quantify PYY concentration with high sensitivity and specificity, supporting investigations into gut-brain axis signaling and the role of gut hormones in energy balance. Widely used in preclinical studies and clinical diagnostics development.