Method introduction: Enzyme-linked immunosorbent assay is a solid-phase adsorption test method in which enzymes are used as label indicators, based on the antigen-antibody reaction, and the results are judged by the degree of chromogen coloration. The degree of color development is expressed by the absorbance (A) value, and the measured A value is related to the level of the antigen or antibody to be tested. Enzyme-linked immunosorbent assay kit: A set of components designed to complete specific in vitro diagnostic tests based on the principle of enzyme-linked immunosorbent assay. It can include coated solid-phase carriers, antibodies/antigens, enzyme conjugates, Buffers, color developing systems, diluents, calibrators, quality control products, etc.