Used in research settings to measure ghrelin levels in biological samples such as serum, plasma, or tissue homogenates. Enables scientists to study appetite regulation, energy balance, and metabolic disorders like obesity and anorexia. Applied in endocrinology and neuroscience studies to investigate the role of ghrelin in gastrointestinal function, stress response, and cognitive processes. Supports drug development and clinical research by providing quantitative data on ghrelin expression under various physiological and pathological conditions.