When the cause of the pleural effusion is unknown a thoracentesis is indicated. This will obtain 50 mL of fluid to be analyzed and it is best for the procedure to be done under ultrasound guidance. The analysis will then provide a differential diagnosis which will affect treatment modalities. Currently, the foundation of the clinical workup is the differentiation between exudates and transudates.
Pleural effusion laboratory findings
Pleural effusion physical examination
Lung mass laboratory findings
Lung abscess laboratory findings
Emphysema physical examination
Pleural effusion classification
Pneumothorax physical examination
Hemoptysis laboratory findings