How long is blood transfusion tubing considered usable after it has been hung?

• A. 2 hours
• B. 8 hours
• C. 4 hours
• D. 6 hours

Answer: (C)

Blood transfusion tubing is treated as a temporary setup that must be changed after a short, defined period to protect the patient. Once the blood is hung and flowing, the internal surfaces of the tubing become a potential site for bacterial growth and contamination, especially if the line sits primed with blood for too long. To minimize infection risk and septic transfusion reactions, the tubing used for a transfusion should be discarded and replaced after that limited window, even if the transfusion is still ongoing. This is why the standard practice is to consider the tubing usable for a fixed short duration after hanging and to replace it when that window ends. Options implying much shorter or much longer times don’t align with this safety practice.