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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.
The condition can make breathing extremely painful. Sometimes it is associated with another condition called pleural effusion, in which excess fluid fills the area between the membrane's layers. The double-layered pleura protects and lubricates the surface of the lungs as they inflate and deflate within the rib cage.eople with asthma may also have asthmatic bronchitis,... In some cases of pleurisy, excess fluid seeps into the pleural space, resulting in pleural effusion. This fluid buildup usually has a lubricating effect, relieving the pain associated with pleurisy as it reduces friction between the membrane's layers.