The Quantikine Human GDF-15 immunoassay is a 3.5 hour solid phase ELISA designed to measure GDF-15 in cell culture supernates, serum, plasma, and urine. It contains CHO cell-expressed recombinant human GDF-15 and has been shown to accurately quantitate the recombinant factor. Results obtained using natural GDF-15 showed linear curves that were parallel to the standard curves obtained using the Quantikine kit standards. These results indicate that this kit can be used to determine relative mass values of naturally occurring GDF-15. Range: 23.40 - 1500 pg/mL. Sensitivity: 4.39 pg/mL. Time: 3.5 hours