Background: The utility of a pretransfusion bedside blood compatibility protocol to decrease immunohemolytic accidents has been questioned for years.
Study Design And Methods: The reliability of a standard bedside ABO compatibility test was evaluated with a stratified random sample of 48 nurses who performed agglutination testing by using Bristol cards, interpreted compatibility, and decided whether to transfuse red cells for 12 randomly and blindly selected donor-and-recipient blood sample pairs. An expert judged technical performance and the interpretation of each card.