We all have these transfusion event stories. Rec'd a phone call in the middle of the night years ago. 3 out of 4 units were transfused to the incorrect patient. Fortunately both pts were O Pos. We used Typenex numbers. BB tech switched the 2 patients; could only be resolved at the bedside. 2u transfused in dialysis. When asked about the "red" numbers I was told that they no longer checked them as they always matched. I informed them that they gave 2u the day before to the incorrect patient.