Oklahoma Blood Institute (OBI) is the sixth largest, non-profit blood collector in America. OBI employs nearly 700 Oklahomans and works with 1,000 volunteers and 2,600 blood drive coordinators.  Blood needed by patients in more than 160 medical facilities in Oklahoma is provided by donors with OBI.  More than 125,000 donors provide more than 250,000 gifts of blood yearly for transfusion and associated clinical services.