Used to measure interleukin-2 (IL-2) levels in human serum, plasma, or cell culture samples with high sensitivity. This assay is commonly applied in immunology research to study T-cell activation and immune responses. It helps in monitoring cytokine production in clinical studies, autoimmune diseases, cancer immunotherapy, and infectious disease research. The high sensitivity allows detection of low-abundance IL-2, making it suitable for samples with limited cytokine concentration. Widely used in both academic and pharmaceutical laboratories for biomarker validation and therapeutic development.