Used in biomedical research to quantify levels of human transferrin receptor (TFR/CD71) in biological samples such as serum, plasma, and cell culture supernatants. This ELISA kit is particularly valuable in studies related to iron metabolism, anemia, and erythropoiesis, as TFR plays a central role in cellular iron uptake. Elevated levels of soluble transferrin receptor are associated with conditions like iron deficiency anemia, making this kit a useful tool in diagnostic research. It is also employed in cancer research, as CD71 expression is upregulated in rapidly dividing cells, including tumor cells. Additionally, the kit supports studies on immune cell activation and neurodegenerative diseases where iron homeostasis is disrupted.