This is a lecture originally given at NGHA Riyadh to the laboratory doctors. I was trying to impress on them how different blood bank was from the rest of the laboratory. I have updated it from its original form.

This presentation is from my time at National Guard Health Affairs Riyadh and suggests an algorithm to assess the clinical significance of the reaction. In my opinion, the essence of immunohematology testing is the antiglobulin test so I would spend much time with technical and medical staff, including trainees/fellows (even those not based in transfusion medicine) to make certain they understood how to interpret it.