Preoperative blood ordering.
D001771:Blood Banks / Q000592:standards; D001787:Blood Group Incompatibility / Q000175:diagnosis; D001788:Blood Grouping and Crossmatching / Q000379:methods*; D001803:Blood Transfusion; D006801:Humans; D007445:Inventories, Hospital; D011300:Preoperative Care / Q000379:methods* / Q000592:standards; D013514:Surgical Procedures, Operative / Q000379:methods; D065227:Transfusion Reaction