This IgG fraction antibody of anti-Human IL-1 Receptor Antagonist has been tested for use in neutralizations, ELISA, radioimmunoassays, western blotting, immunohistochemistry and flow cytometry. Reactivity in other immunoassays is unknown. This product has been assayed by immunoblot using HRP Goat-anti-Rabbit IgG [H&L] (code # 611-1302) and TMB as a substrate. A working dilution range of 1:400 to 1:800 is suggested for this application. This product has been assayed by ELISA against IL-1 Receptor Antagonist using HRP Conjugated Anti-Rabbit IgG [H&L] (Goat) (code # 611-1302) and ABTS as a substrate for 30 minutes at room temperature. A working dilution range of 1:500 to 1:1,000 is suggested for this product. For use in ELISA formats, this antibody is best used as the second antibody in combination with a monoclonal antibody as a capture antibody. This product has been assayed by immunohistochemistry. A dilution of 1:400 or greater is suggested for this immunoassay. Either paraffin fixation or cryofixation can be used for immunohistochemistry. This product has been assayed by radioimmunoassay against antigen. A dilution of 1:8,000 is suggested for this immunoassay.