Which statement best differentiates pleural effusion, hemothorax, and chylothorax based on drainage color?

• A. Hemothorax drainage is blood-tinged.
• B. Drainage characteristics cannot distinguish among them.
• C. Pleural effusion drainage is typically clear or straw-colored.
• D. Chylothorax drainage is milky.

Answer: (C)

Color of drainage helps distinguish these conditions because pleural effusion from non-bloody fluid is typically clear or straw-colored, reflecting serous exudate or transudate. Hemothorax involves blood entering the pleural space, so the drainage is blood-tinged or bloody. Chylothorax results from lymph leakage rich in triglycerides, producing a milky, opaque fluid. Therefore, describing pleural effusion drainage as clear or straw-colored best separates it from the other two by color alone. In real life, color is a clue but not definitive; fluid analysis and clinical context are needed for confirmation.