The Quantikine Mouse/Rat FGF-21 immunoassay is a 4.5 hour solid-phase ELISA designed to measure FGF-21 in mouse or rat cell culture supernates, serum, and plasma. It contains E. coli-expressed recombinant mouse FGF-21 and antibodies raised against the recombinant factor. This immunoassay has been shown to accurately quantitate the recombinant mouse FGF-21. Results obtained using natural mouse or rat FGF-21 showed dose response curves that were parallel to the standard curves obtained using the Quantikine mouse kit standards. These results indicate that this kit can be used to determine relative mass values for natural FGF-21. Range: 31.30 - 2000 pg/mL. Sensitivity: 13.4 pg/mL. Time: 4.5 hours