KE00004 is a solid phase sandwich Enzyme Linked-Immuno-Sorbent Assay (Sandwich ELISA). The CRP ELISA kit is to be used to detect and quantify protein levels of endogenous CRP. The assay recognizes human CRP. A monoclonal antibody specific for CRP has been pre-coated onto the microwells. The CRP protein in samples is captured by the coated antibody after incubation. Following extensive washing, a monoclonal antibody of biotinylated specific for CRP is added to detect the captured CRP protein. For signal development, Streptavidin-HRP is added, followed by Tetramethyl-benzidine (TMB) reagent. Solution containing sulfuric acid is used to stop color development and the color intensity which is proportional to the quantity of bound protein is measurable at 450nm.