How will you check the functioning of an ICD tube?

Chest drainage system: Follow-up: Patency of chest tube is assessed by observing the oscillations in water seal chamber with respiratory movements. Position of chest tube & resolution of intrapleural air or liquid is checked by x-ray (AP & cross table lateral). Tube should be pulled back if it crosses the mediastinum Removal: Chest tubes are generally removed when there has been air or fluid drainage of <200 ml in 24 hours for >24 hours .