Used in immunological research to quantitatively measure 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 related to immune response, viral infections, autoimmune diseases, and cancer immunotherapy. The kit supports high-throughput analysis with reliable sensitivity and specificity, making it suitable for both basic research and preclinical studies. Commonly applied in monitoring immune system dynamics and evaluating therapeutic interventions targeting cellular immunity.