The quantikine Rabbit Growth Hormone Releasing Peptide (GHRP) immunoassay is a 4.5 hour solid phase elisa designed to measure Rabbit Growth Hormone Releasing Peptide (GHRP) levels in cell culture supernates, serum, and plasma. It contains e. Coli-expressed recombinantRabbit Growth Hormone Releasing Peptide (GHRP) and antibodies raised against recombinant Rabbit Growth Hormone Releasing Peptide (GHRP). This immunoassay has been shown to accurately quantitate the recombinant factor. Results obtained using natural Rabbit Growth Hormone Releasing Peptide (GHRP) showed dose response curves that were parallel to the standard curves obtained using the recombinant quantikine kit standards. These results indicate that this kit can be used to determine relative mass values for natural Rabbit Growth Hormone Releasing Peptide (GHRP)