Before removing a chest tube, what should the status of the air leak be?

• A. A continuous air leak for 24 hours
• B. Intermittent air leak
• C. Large air leak
• D. None for 24 hours

Answer: (D)

The main idea is that removing a chest tube should only be done when the pleural space has sealed and there is no ongoing air entering from the lung. An air leak seen in the water-seal chamber means air is still escaping into the pleural space, so removing the tube could allow the lung to collapse again or cause a recurrent pneumothorax. Therefore, the safest criteria are no air leak for a sustained period, typically 24 hours, ideally with radiographic evidence of lung re-expansion. If there is still any bubbling (air leak) during that time, the tube should not be removed.