At our facility, we had two units that were crossmatched for a patient. The tech issued the first unit in computer but gave the 2nd unit to the nurse for transfusion. The nurse transfused the 2nd unit but the first unit was showing issued in the computer. The unit and paperwork all matched and the correct patient received the unit without harm but am I required to report to FDA due to computer discrepancy of wrong unit showing issued in computer? We corrected the computer part and the patient received the other unit of blood the next day. I did counsel the tech and show him how to issue by unit number so that this will not happen again. Please give me your thoughts.