The pleural fluid Gram stain is a test to diagnose bacterial infections in the lungs.
Gram stain of pleural fluid
Pleural fluid is found in the space around the lungs. In a variety of diseases, an abnormal amount of pleural fluid builds up in the lungs.
A sample of the pleural fluid is needed for this test. For information on how the sample is obtained, see:
The fluid sample is placed onto a microscope slide and mixed with a violet...Read more