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Pleural fluid analysis is a test that examines a sample of fluid that has collected in the pleural space. This is the space between the lining of the outside of the lungs (pleura) and the wall of the chest. When fluid collects in the pleural space, the condition is called pleural effusion.
1 visceral pleura-covers the lungs. 2  pleural fluid-secreted by pleura and fills the pleural space. 3  the pleural fluid creates a fluid bond (and an associated negative Intrapleural pressure) that pulls the visceral pleura against the parietal pleura.