Sounds like a systems problem that everyone can learn from (many errors are). The ordering MD should have entered an order to d/c the blood. You did tell your charge nurse that the blood was no longer needed so maybe you thought that was the last time you would have to think about it. In an ideal world, you would have had the time to notify the blood bank that you did not need the blood or have watched for it's arrival and send it back. Where I work, once the order for a blood product is entered by the physician, the nurse is required to send a requisition form to the blood bank notifying them that she (he) is ready to receive. The blood is send through the hospital's pneumatic tube system and whenever something is delivered a rings a bell until the delivery is taken out. There have been a few times that I can remember in the past 20 years where blood has arrived and unfortunately everyone on the unit was too busy to notice. Unfortunately sometimes things like this happen. If you haven't already, fill out a variance (incident) report. Although you may usually think of these kinds of reports for errors or patient harm (medication error, patient injury), this is not to place blame, but to provide insight into how these sorts of things can happen. It will also show your manager that you understand your part in why this occurred.