SHBC latex microspheres (50nm-400nm) can be applied in particle enhanced immunoturbidimetry, an improved immunoturbidimetric analysis method based on polyclonal antibodies. Genetic engineering methods are used to combine antibodies with latex particles, and when antigen antibodies combine, an antigen antibody latex microparticle complex is formed, enhancing reaction absorbance. Solid phase immunoassay, latex agglutination test, and microsphere capture enzyme-linked immunosorbent assay are also used in various projects.