Before I retired, we used leuko-reduced RBCs with antibody. When we began, we kept extensive records to study if the use of such RBCs caused subsequent problems; they did not. I certainly think O neg RBCs with antibody are suitable for trauma patients since much of the antibody will bleed out. Using these units increases the number of available O neg RBCs. Like David, I wouldn't use them for NICU patients. I might also avoid using them for patients with sickle cell anemia. Since these patients make so many antibodies, I wouldn't want to do anything that could potentially complicate subsequent antibody ID. We had a poster session at the 2010 AABB meeting discussing the impact.