Which action would compromise a Foley catheter's closed system?

• A. Keeping the bag below bladder level
• B. Securing tubing to prevent tugging
• C. Cleaning the catheter hub with antiseptic before reconnecting
• D. Opening the drainage system to air during bag change

Answer: (D)

Maintaining a Foley catheter as a closed drainage system is essential to prevent bacteria from entering the urinary tract. The system stays sealed from the catheter lumen to the collection bag and the surrounding environment. Keeping the bag below bladder level supports continuous drainage and helps prevent backflow. Securing the tubing prevents tugging that could pull on connections or cause leaks, preserving sterility. Cleaning the catheter hub with antiseptic before reconnecting helps maintain a sterile junction. Opening the drainage system to air during a bag change, however, breaks that seal and allows air and environmental bacteria to enter, increasing the risk of infection by providing an entry path into the bladder.