Pleural fluid Gram stain
Alternative Names: Gram stain of pleural fluid
The pleural fluid Gram stain is a test to diagnose bacterial infections in the lungs.
Why is the Test Performed?
The test is performed when the health care provider suspects an infection of the pleural space, or when a chest x-ray reveals an abnormal collection of pleural fluid.
How is the Test Performed?
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: Thoracentesis
The fluid sample is placed onto a microscope slide and mixed with a violet stain (called a Gram stain). A laboratory specialist uses a microscope to look for bacteria on the slide. If bacteria are present, the color, number, and structure of the cells are used to identify the specific organism.
Preparation for the Test
See:ThoracentesisHow will the Test Feel?
See: Thoracentesis
Pleural fluid Gram stain Risks
See:ThoracentesisNormal Results for Pleural fluid Gram stain
Normally, no bacteria is seen in the pleural fluid.
The examples above are common measurements for results of these tests. Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your doctor about the meaning of your specific test results.
What Abnormal Results Mean
You may have a bacterial infection of the lining of the lungs (pleura).
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Learn more about Pleural fluid Gram stain
Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
Copyright 2012 A.D.A.M., Inc.
