Used in immunological research to quantify levels of soluble interleukin-2 receptor alpha (sIL-2Rα) in biological samples such as serum, plasma, or cell culture supernatants. This ELISA kit helps assess T-cell activation and immune system status, as elevated sIL-2Rα levels are associated with autoimmune diseases, transplant rejection, and certain cancers like lymphoma. It is widely used in clinical research and drug development to monitor disease progression and therapeutic response.