Pleural fluid smear
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Pleural fluid smear

Definition

Pleural fluid smear is a laboratory procedure to check for bacteria, fungi, or abnormal cells in the fluid that may be found in the space around the lungs (called a pleural effusion).

How the Test is Performed

A health care or laboratory technician provider examines a sample of pleural fluid under the microscope. If the smear detects bacteria or fungi, other methods may be used to further identify those organisms.

How the Test Will Feel

The sample is obtained through a procedure called thoracentesis. For information about this test and its risks, see thoracentesis.

Why the Test is Performed

The test is performed if you have a pleural effusion and its cause is not known, especially if the health care provider suspects an infection or cancer.

Normal Results

Normally, no bacteria, fungi, or cancer cells are present in the pleural fluid.

Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.

What Abnormal Results Mean

Positive results may indicate that infection, or cancer cells, is present. Other tests can help identify the specific type of infection or cancer. Sometimes, the test may show abnormalities from conditions such as systemic lupus erythematosus.

Risks

See: Thoracentesis

References

Broaddus VC, Light RW. Pleural effusion. In: Mason RJ, Broaddus VC, Martin TR, et al, eds. Murray and Nadel’s Textbook of Respiratory Medicine. 5th ed. Philadelphia, Pa: Saunders Elsevier; 2010:chap 73.

McCool FD. Diseases of the diaphragm, chest wall, pleura, and mediastinum. In: Goldman L, Schafer AI, eds. Cecil Medicine. 24th ed. Philadelphia, PA: Saunders Elsevier; 2011:chap 99.


Review Date: 12/12/2011
Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; and Denis Hadjiliadis, MD, Assistant Professor of Medicine, Division of Pulmonary, Allergy and Critical Care, University of Pennsylvania, Philadelphia, PA. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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