Human Interleukin-2 (IL-2) OneStep ELISA Kit is a one-step quick immunoassay designed to measure human IL-2 levels in cell culture supernates, serum, and plasma. This assay kit is a standard sandwich-ELISA format. It contains recombinant human IL-2 and a pair of antibodies against the recombinant factor, which are provided by ACROBiosystems. Results are obtained by four parameter logistic curve that were parallel to the standard curves obtained. The verification results indicate that this kit can be used for the quantitative determination of natural and recombinant human IL-2 concentrations. The specificity has been verified.