Milky drainage from a chest tube most strongly suggests which condition?

• A. Serous drainage is commonly observed.
• B. Bloody drainage may indicate intrathoracic bleeding.
• C. Bright red drainage is always normal.
• D. Milky drainage suggests chylothorax.

Answer: (D)

Milky drainage from a chest tube points to chylothorax, the accumulation of lymphatic fluid in the pleural space due to injury or obstruction of the thoracic duct. Chyle carries dietary fats absorbed from the gut, so it has a high triglyceride content and often a milky appearance after meals. This fluid is distinct from serous drainage, which is clear to pale yellow, and from bloody drainage, which reflects intrathoracic bleeding. If chylothorax is suspected, checking pleural fluid triglycerides and the presence of chylomicrons can confirm, and management centers on addressing the leak and nutrition.