The Quantikine Human G-CSF Immunoassay is a 3.5 or 4.5 hour solid phase ELISA designed to measure G-CSF in cell culture supernates, serum, and plasma. It contains E. coli-expressed recombinant human G-CSF and antibodies raised against the protein. It has been shown to accurately quantitate recombinant human G-CSF. Results obtained using natural human G-CSF 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 for natural human G-CSF. Range: 39.00 - 2500 pg/mL. Sensitivity: 20 pg/mL. Time: 3.5 hours or 4.5 hours