Interleukin-6 is a cytokine produced in response to infections or tissue damage that plays an important role in inflammation, immune response and hematopoiesis. The Colorimetric Human IL-6 Detection Kit is designed for detecting and quantifying human interleukin-6 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-6 are incubated on the coated plate followed by detecting the captured IL-6 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.