The kit assay Rat 8-OHdG level in the sample, use Purified Rat 8-OHdG to coat microtiter plate wells, make solid-phase antibody, then add 8-OHdG to wells, Combined antibody which With HRP labeled goat anti-mouse become antibody - antigen - enzyme-antibody complex, after washing Completely, Add TMB substrate solution,TMB substrate becomes blue color At HRP enzyme-catalyzed, reaction is terminated by the addition of a sulphuric acid solution and the color change is measured spectrophotometrically at a wavelength of 450 nm. The concentration of 8-OHdG in the samples is then determined by comparing the O.D. of the samples to the standard curve.