National Shortage of Type O Blood: What Anesthesiologists Can Do

Chronic shortages of type O red blood cells, particularly O-negative units, represent a growing national concern that threatens transfusion readiness and patient safety. Despite O-negative blood type comprising only 6.9% of the U.S. population, demand for O-negative red blood cells now exceeds 12% of all transfused units. Overutilization—especially transfusion to non–O-negative recipients, routine emergency use, and expiration-driven practices—has intensified the imbalance. Demographic shifts toward a more ethnically diverse donor base may further exacerbate this mismatch. In response, the American Red Cross launched the Empower Group O Care Initiative, promoting the principles to “Start Smart” and “Switch Sooner”: initiating emergency transfusions with O-positive red blood cells in males and females beyond childbearing potential and converting to type-specific products as early as feasible. Anesthesiologists, who administer up to 60% of U.S. transfusions, play a pivotal role in stewardship efforts to optimize utilization, preserve scarce O-negative blood, and strengthen the national blood supply.