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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.
A: In simple terms, a pleural effusion is the collection of fluid between the layers in the pleural space. This is the space between the outside of the lungs and the inside of the chest cavity and is lined by thin layers of tissue.e all do one common thing every second of our lives and that is breathing. It may seem like a simple process but it has vital significance. Pleural effusion indicates a condition when this simple process becomes complicated. In lay man terms, the condition can be explained as water around the lungs.