Human Activin Receptor Type IIA / ACVR2A ELISA Kit (A302847) employs the sandwich enzyme immunoassay technique for the quantitative measurement of human Activin Receptor Type IIA / ACVR2A in serum, plasma, tissue homogenates, and other biological fluids. An antibody specific for Activin Receptor Type IIA / ACVR2A has been pre-coated onto a 96-well microtiter plate. The standards and test samples are added into the wells and the Activin Receptor Type IIA / ACVR2A present in each sample is bound to the wells by the immobilized antibody. Following incubation, the wells are washed and then incubated with Biotinylated Anti-Activin Receptor Type IIA / ACVR2A Antibody, which binds the captured Activin Receptor Type IIA / ACVR2A present in each well. Following incubation, unbound biotinylated detection antibody is removed by washing, and an HRP-Streptavidin conjugate is added to the wells and the microtiter plate is incubated. Following incubation and washing, TMB substrate solution is then used to visualize the HRP enzymatic reaction by catalysis to produce a blue-coloured product that changes to yellow after addition of acidic stop solution. The density of yellow is proportional to the amount of Activin Receptor Type IIA / ACVR2A captured in each well. The concentration of Activin Receptor Type IIA / ACVR2A can then be calculated by reading the O.D. absorbance at 450nm in a microplate reader and referring to the standard curve.