Used in research settings to quantitatively measure S100A9 protein levels in biological samples such as serum, plasma, and tissue homogenates. This kit is particularly valuable in studies related to inflammation, immune response, and autoimmune diseases like rheumatoid arthritis and inflammatory bowel disease. It is also applied in cancer research, especially in investigations involving myeloid-derived suppressor cells and tumor microenvironment interactions. The assay supports biomarker validation and therapeutic monitoring in preclinical models, enabling high-throughput analysis with reliable sensitivity and specificity.