When assisting with thoracentesis, what characteristic of the fluid should the nurse expect if empyema is present?

In the presence of empyema, the characteristic of the fluid is expected to be thick and opaque. Empyema refers to the accumulation of pus in the pleural space, often resulting from infection, which causes the pleural fluid to become cloudy or turbid due to the presence of white blood cells, bacteria, and debris. This thick and opaque quality indicates a significant inflammatory response and infection, different from other types of pleural effusions where the fluid might be clearer or have different properties. Recognizing these characteristics is crucial for the healthcare provider to properly assess the condition and determine appropriate interventions.