Erythropoietin is special type of protein biomarker, also known as a growth factor. It acts by the stimulating the bone marrow to manufacture red blood cells. There are five different types of erythropoietin biomarkers such as epoetin alfa, epoetin beta, epoetin zeta, epoetin theta and darbepoetin alfa. Erythropoietin is mostly administered subcutaneously as an alternative to iron supplements. Erythropoietin used in human beings is also known as recombinant human erythropoietin (rHuEPO). ... Read more