Pleural fluid analysis in empyema is typically exudative. Which option best reflects this finding?

Pleural fluid analysis in empyema is typically exudative. Which option best reflects this finding?

• A. Exudative
• B. Transudative
• C. Hemorrhagic
• D. Clear

Answer: (A)

In empyema, the pleural space is infected and inflamed, so the inflammatory process makes the capillaries leak protein-rich fluid into the space. This creates an exudative pleural effusion, which is defined by Light’s criteria as having relatively high protein and LDH in the pleural fluid compared with serum. You’ll also often see neutrophil predominance, low pH, and low glucose in the infected fluid, all signaling an exudative process driven by infection. Transudates come from systemic factors like heart failure or cirrhosis and have lower protein and LDH, while hemorrhagic or clear descriptions don’t fit the typical infected effusion. Therefore, exudative best reflects empyema.

In empyema, the pleural space is infected and inflamed, so the inflammatory process makes the capillaries leak protein-rich fluid into the space. This creates an exudative pleural effusion, which is defined by Light’s criteria as having relatively high protein and LDH in the pleural fluid compared with serum. You’ll also often see neutrophil predominance, low pH, and low glucose in the infected fluid, all signaling an exudative process driven by infection. Transudates come from systemic factors like heart failure or cirrhosis and have lower protein and LDH, while hemorrhagic or clear descriptions don’t fit the typical infected effusion. Therefore, exudative best reflects empyema.