Recombinant human erythropoietin (rHuEpo) is a genetically engineered hormone sometimes misused by high-performance athletes such as cyclists and marathon runners to boost their endurance. The potential misuse of the drug is detected in urine collected from athletes. Since the test was introduced in 2000, 33 labs around the world have been accredited by the World Anti-Doping Agency (WADA) to administer the procedure.