Used to measure interleukin-15 (IL-15) levels in biological samples such as serum, plasma, or cell culture supernatants from rats. This kit is commonly applied in immunology and inflammation research to study the role of IL-15 in immune cell activation, particularly natural killer (NK) cells and T cells. It supports investigations into autoimmune diseases, infectious diseases, and cancer immunotherapy by providing a reliable method to quantify IL-15 concentration. The assay is useful in preclinical studies where rat models are employed to understand immune responses and evaluate therapeutic interventions.