During monitoring of a chest drainage system, which element should be checked periodically?

• A. The drainage color
• B. The length of the tubing
• C. The water level in the chest tube operating system
• D. The time since insertion

Answer: (C)

Maintaining the water level in the suction control and water-seal portion of the chest drainage system is essential because that water column governs the suction applied and the airtight seal that allows drainage while preventing air from entering the chest. If the water level is too low or the seal is depleted, suction can be lost and the system won’t evacuate air effectively; if the level is too high, there can be excessive suction or back pressure. Regularly checking and adjusting the water level (keeping it at the prescribed amount with sterile water) helps ensure the system functions correctly. Drainage color, tubing length, or time since insertion don’t reflect the ongoing performance of the drainage mechanism, whereas the water level directly indicates that the system is operating as intended.