Used in immunological research to quantify levels of interleukin-2 receptor (IL-2R) in biological samples such as serum, plasma, or cell culture supernatants. This kit enables researchers to monitor T-cell activation, as IL-2R is upregulated during immune responses. It is particularly useful in studies related to autoimmune diseases, transplant rejection, and cancer immunotherapy. The assay provides a sensitive and specific means to assess immune system activity and evaluate therapeutic interventions targeting T-cell signaling pathways.