Under the new ISBT labeling system, an aliquot (ISBT divided) unit has the split designation attached to the unit #. ie AO, BO, CO, DO....depending on how many times the parent unit was split. The next generation of split units would have another designation. If the unit has that designation it is billed at the divided price, if not no matter how much of the unit was transfused it is billed at the full unit price. We bill all divided units that have been ordered (designated) for a specific patient to that patient account if transfused, any other splits from that designated unit are billed to the hospital as wasted.