Unidentified cells/Leukocytes (Pleural Fluid)

A pleural fluid analysis is a group of tests that examine a sample of abnormal fluid that builds up in the space between your lungs and chest wall. This space is called the pleural space.

A pleural fluid analysis helps find the cause of a pleural effusion. There are different types of fluid that can build up in the pleural space. The type of fluid you have will depend on the cause. A pleural fluid analysis is used to figure out which type of fluid you have. This information helps narrow down the possible causes.