Used in biomedical research to measure Peptide YY (PYY) levels in human biological samples such as plasma or serum. This assay helps investigate gut-brain axis signaling, particularly in studies related to appetite regulation, obesity, metabolic disorders, and gastrointestinal function. Researchers use the kit to quantify PYY concentration in clinical and experimental settings, supporting studies on hormone secretion, satiety mechanisms, and energy balance. It is suitable for evaluating endocrine responses to meals, bariatric surgery, or pharmacological interventions targeting gastrointestinal hormones.