Used in biomedical research to measure ghrelin levels in biological samples such as serum, plasma, or tissue extracts. Helps in studying appetite regulation, energy balance, and metabolic disorders like obesity and diabetes. Commonly applied in endocrinology and neuroscience studies to investigate the role of ghrelin in hunger signaling and its interaction with growth hormone pathways. Also utilized in preclinical drug development to assess the impact of therapeutic compounds on ghrelin secretion and activity.