Pleural fluid cultures in empyema are typically obtained via which procedure?

• A. Thoracentesis
• B. Bronchoscopy
• C. Sputum culture
• D. Pleural biopsy

Answer: (A)

Sampling pleural fluid directly from the infected space is essential in empyema to identify the organism and tailor antibiotics. Thoracentesis allows you to access the pleural space and withdraw pleural fluid for culture (and Gram stain), typically under ultrasound guidance, providing the highest diagnostic yield for pleural infection. Bronchoscopy looks inside the airways and yields bronchial secretions, not pleural fluid. Sputum culture reflects organisms from the lower respiratory tract rather than the pleural space. Pleural biopsy retrieves pleural tissue, which helps diagnose certain causes of effusions but does not provide pleural fluid culture results. Therefore, thoracentesis is the procedure used to obtain pleural fluid cultures in empyema.