Used in immunological research to detect and quantify Granzyme B levels in biological samples such as serum, plasma, and cell culture supernatants. Enables assessment of cytotoxic T-cell and natural killer (NK) cell activity, which is critical in studying immune responses, autoimmune diseases, viral infections, and cancer immunotherapy. The kit supports high-throughput analysis with high sensitivity and specificity, making it suitable for both basic research and preclinical studies. Commonly applied in monitoring immune activation in experimental models and evaluating the efficacy of therapeutic interventions targeting immune cell function.