What should be done if a noticeable clot is found in an RBC unit?

If a noticeable clot is found in a red blood cell (RBC) unit, the unit should not be transfused. It should be immediately reported to the blood bank or transfusion service for further evaluation. The unit may need to be discarded, and further investigation should be conducted to determine the cause of the clot, ensuring the safety of future blood products. Additionally, the patient should be monitored for any potential complications.