Used in immunological research to quantify Granzyme A levels in biological samples such as serum, plasma, or cell culture supernatants. Enables assessment of cytotoxic T-cell and natural killer (NK) cell activation, which is critical in studies of immune response, autoimmune diseases, viral infections, and cancer immunotherapy. The kit supports high-throughput screening and provides a reliable method for monitoring immune system activity in experimental models and clinical research settings.