Which drainage color may indicate intrathoracic bleeding?

• A. Serous drainage may indicate intrathoracic bleeding.
• B. Bloody drainage may indicate intrathoracic bleeding.
• C. Milky drainage may indicate chylothorax.
• D. Clear drainage.

Answer: (B)

Bloody drainage indicates intrathoracic bleeding because blood entering the pleural space will come out of the chest tube as red or dark fluid, signaling active hemorrhage from within the chest after trauma or surgery. This direct indicator prompts careful monitoring of the patient and potential interventions to control the bleeding.

In contrast, milky drainage points to a chylothorax from lymphatic leakage, serous drainage is a pale yellow fluid from tissue irritation or inflammation, and clear drainage is not characteristic of bleeding. (Note: small amounts of blood can mix with other fluids to create serosanguinous drainage, but pronounced red drainage is the strongest sign of intrathoracic bleeding.)