PLEURAL FLUID LabTest

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Pleural fluid is a liquid derived from the blood in the tiny blood vessels (capillaries) in the lungs. It is found in small quantities between the layers of the pleurae – membranes that cover the chest cavity and the outside of each lung. It serves as a lubricant for the movement of the lungs during breathing.
A variety of conditions and diseases can cause inflammation of the pleurae (pleuritis) and/or excessive accumulation of pleural fluid (pleural effusion). Pleural fluid analysis is a group of tests that evaluate this liquid to determine the cause of the increased fluid.

The two main reasons for fluid accumulation in the pleural space are:

1.An imbalance between the pressure of the liquid within blood vessels, which drives fluid out of blood vessels, and the amount of protein in blood, which keeps fluid in blood vessels. The fluid that accumulates in this case is called a transudate. This type of fluid more commonly involves both sides of the chest and is most frequently a result of either congestive heart failure or cirrhosis.
2.An injury to or inflammation of the pleurae, in which case the fluid that accumulates is called an exudate. It more commonly involves one side of the chest and may be seen in infections (pneumonia, tuberculosis), malignancies (lung cancer, metastatic cancer, lymphoma, mesothelioma), or other causes of inflammation (sarcoidosis, autoimmune diseases).
 
Determining the type of fluid present is important because it helps to shorten the list of possible causes of pleural effusion. Healthcare practitioners and laboratorians use an initial set of tests (cell count, protein, albumin, and lactate dehydrogenase (LD) level, and appearance of the fluid) to distinguish between transudates and exudates. If the fluid is an exudate, additional tests may be performed to further pinpoint the disease or condition causing pleuritis and/or pleural effusion. See the "The Test" tab for more on this.


https://labtestsonline.org/tests/pleural-fluid-analysis

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