Used to measure granulocyte macrophage colony-stimulating factor (GM-CSF) levels in human biological samples such as serum, plasma, or cell culture supernatants. It is widely applied in clinical research and immunology studies to investigate immune responses, inflammation, and hematopoiesis. The kit helps in diagnosing and monitoring diseases like autoimmune disorders, cancers, and infectious diseases where GM-CSF plays a role in immune cell activation and differentiation. It is also used in therapeutic development to evaluate the effect of drugs on cytokine production.