Used in immunological research to detect and quantify soluble ULBP-3 protein levels in human biological samples such as serum, plasma, or cell culture supernatants. This kit is particularly valuable in studies related to immune activation, viral infections, and cancer immunology, as ULBP-3 is a stress-induced ligand recognized by the NKG2D receptor on natural killer (NK) cells and T cells. By measuring ULBP-3 expression, researchers can assess cellular stress responses, tumor immune surveillance, and the impact of therapeutic agents on the innate immune system. The assay supports high sensitivity and specificity, enabling accurate determination of protein concentration in complex samples for both basic research and clinical investigation.