Used in immunological research to quantify levels of soluble interleukin-2 receptor beta chain in biological samples such as serum, plasma, or cell culture supernatants. This ELISA kit helps assess immune system activation, particularly in studies related to T-cell and natural killer (NK) cell function. It is commonly applied in research on autoimmune diseases, transplant rejection, and certain cancers like lymphoma, where elevated levels of soluble IL-2Rβ serve as a biomarker of disease activity or progression. The assay enables high-sensitivity detection, supporting both clinical research and drug development efforts targeting immune regulation pathways.