Used in biomedical research to measure leptin levels in human serum, plasma, or cell culture samples. Enables study of appetite regulation, obesity, metabolic disorders, and endocrine function. Commonly applied in clinical labs and research settings to investigate adipokine signaling and energy balance. Supports studies on insulin resistance, polycystic ovary syndrome (PCOS), and weight management interventions. Provides quantitative data for understanding leptin’s role in inflammation and immune responses.