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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.
Your doctor may also take X-rays of your chest. These X-rays will be normal if you have only pleurisy without fluid but may show fluid if you have a pleural effusion. They can also show if pneumonia is the cause of the pleurisy. CT scans and ultrasound scans may also be used to better visualize the pleural space.If there is a large amount of fluid present, your doctor may draw a sample of pleural fluid for analysis. Your doctor will determine the exact location of the fluid.n the case of pleural effusion, your doctor will direct treatment towards the underlying cause of the fluid. Sometimes, if the pleural fluid is infected or the amount is excessive, the doctor may drain it through a tube inserted in your chest, a procedure that requires hospitalization.