The only source I have here at home right now is my AABB Technical Manual. It does discuss the problem of potassium leak in stored, irradiated CPDA-1 RBCs, stored for greater than 24 hours and suggests washing them. I think they are referring to older units or aliquots that have been irradiated more than a day before transfusion. This would work if your facility has an irradiator and the capability of washing cells. I remember at the hospital that I was previously employed, we would aliquot the the blood and then irradiate the aliquot just prior to transfusion. Where I work now, we have neither an irradiator or a cell washer. We deal with neonates but we are part of a health system that can transfer the very sick babies to another hospital in the system so we basically get O positive and O negative, CPDA-1, CMV and hemoglobin S negative, irradiated units from Red Cross and aliquot from the units as we need them. Most babies get one or two aliquots from the unit when they are still fresh and the remainder is given to an adult if the unit has more than 200 mls left.