A blood bike is a motorcycle used to courier urgent and emergency medical items including blood, X-rays, samples, drugs, and documentation between hospitals and other healthcare facilities. In the United Kingdom and Ireland, a network of largely independent registered charities, whose members are all unpaid volunteers, provide blood bike courier services in collaboration with their local healthcare authorities. Many are represented through the Nationwide Association of Blood Bikes (NABB). Commercially-run blood bike courier services also exist.