Used in immunological research to quantify transfer factor (TF) levels in biological samples. Enables assessment of cell-mediated immune responses by detecting TF proteins involved in immune signal transmission between cells. Commonly applied in studies related to immune system modulation, infectious diseases, and autoimmune disorders. Supports evaluation of immune function in clinical and experimental settings, particularly in research exploring immune enhancement or regulation. Suitable for serum, plasma, and cell culture supernatant analysis. Provides a reliable, sensitive method for monitoring TF concentration changes in response to treatments or disease states.