I am pulling information from the 17th edition of AABB's technical manual and giving our facility's interpretation : Because patients can experience transfusion reactions several hours to days after the transfusion is complete, medical staff should continue to monitor the patient periodically for 4 to 6 hours after the end of the transfusion to detect febrile or pulmonary reactions that may be associated with blood administration. If the patient is not under direct medical supervision after the transfusion event, medical staff should provide written instructions to the patient and caregiver about signs and symptoms to be aware of and report, and they should ensure that the patient has a phone number to call or a person to contact should a reaction occur later. We monitor the outpatient transfusions for 1 hour after the completion of the transfusion and then the patient has written instructions detailing transfusion reaction signs and symptoms, a contact number to call, and further instructions to present to the Emergency Department if symptoms progress. Hope this is what you were looking for.