【Principle】 This product was developed by double antibody sandwich method, respectively, in the detection of nitrocellulose membrane coated with anti-transferrin antibody and in the control area coated goat anti-mouse IgG. At the time of detection, the transferrin antigen in the sample can be combined with the colloidal gold-antibody coated at the front of the reagent to form an immune complex. Such as positive samples, respectively, in the detection zone and the control area of the aggregation of the formation of a ribbon; the case of negative samples, only the control area to form a ribbon. The main components of colloidal gold, anti-transferrin monoclonal antibody and goat anti-mouse IgG polyclonal antibody. 【Storage conditions and validity】 Storage conditions: Store at 4 ℃ ~ 30 ℃ in dark and dry place. Valid for 24 months. [Intended use] The product is used in vitro qualitative detection of human transferrin in the sample content. Healthy daily gastrointestinal physiological blood loss of 0.6ml, greater than 2ml that is pathological bleeding. The ratio of hemoglobin to transferrin in the blood was 51.2: 1, while the ratio of hemoglobin to transferrin was 5.4: 1 . Transferrin is a beta globulin, present in the plasma, when gastrointestinal bleeding (including occult blood - the naked eye and the microscope can not see the bleeding), plasma transferrin will leak into the gastrointestinal tract, and With the feces excreted [2-3]. When the human sample in the transferrin content of 40ng / ml can be detected.