Used in immunological research to detect and quantify levels of rat intercellular protein Fgl2 in biological samples such as serum, plasma, or tissue homogenates. This ELISA kit is particularly useful in studies related to immune regulation, inflammatory responses, and coagulation pathways, as Fgl2 is involved in mediating immune suppression and has prothrombinase activity. Researchers apply this kit in experimental models of transplantation, viral infections like hepatitis, and autoimmune diseases to assess Fgl2 expression as a biomarker of regulatory T cell and dendritic cell function. The assay enables high-throughput, sensitive, and specific measurement, supporting data collection in mechanistic studies and therapeutic development.