Interleukin-10 is a key immunoregulator during various infections that acts as an anti-inflammatory cytokine by inhibiting the activities of Th1, macrophage and NK cells. The IL-10 (Human) Colorimetric ELISA Detection Kit is designed for detecting and quantifying human interleukin-10 in cell culture medium. Only a few simple steps on a microtiter plate are required for the assay. First, the capturing antibody is coated on a 96-well plate. Next, samples containing IL-10 are incubated on the coated plate followed by detecting the captured IL-10 with the detection antibody. Finally, the plate is treated with streptavidin-HRP followed by addition of a colorimetric HRP substrate to produce color, which can then be measured using a UV/Vis spectrophotometer microplate reader.