Rabble rabble rabble ! We determined our procedure based on our own experience and a creative interpretation/application of AABB 5.14.3 in general. If you read 5.14.3.2 it says: "If the patient has been transfused in the preceding 3 months with blood or a blood component containing allogeneic red cells, if the patient has been pregnant within the preceding 3 months, or if the history is uncertain or unavailable, a sample shall be obtained from the patient within 3 days of the scheduled transfusion. Day 0 is the day of draw." We complete our requirements for standard 5.14.3.3, with the initial specimen: "In patients with previously identified clinically significant antibodies, methods of testing shall be those that identify additional clinically significant antibodies."