MedlinePlus Medical Encyclopedia: Sputum smear (KOH test)

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Sputum smear (KOH test)

Contents of this page:
Illustrations Alternative names Definition How the test is performed How to prepare for the test How the test will feel	Why the test is performed Normal Values What abnormal results mean What the risks are Special considerations

Illustrations

Sputum test

Alternative names Return to top

KOH test; Fungal smear

Definition Return to top

Sputum smear (KOH test) is a test for the presence of fungal microorganisms in sputum.

How the test is performed Return to top

Obtain a sputum sample by coughing deeply and expelling the material that comes from the lungs (sputum) into a specimen container. A smear of sputum is prepared with potassium hydroxide (KOH) and examined under the microscope. If it is positive, fungal cells can be observed.

How to prepare for the test Return to top

There is no special preparation.

How the test will feel Return to top

There is no discomfort.

Why the test is performed Return to top

The test may be performed when there is abnormal sputum production or when an infection of the lungs is suspected.

Normal Values Return to top

No presence of organisms is normal.

What abnormal results mean Return to top

Abnormal results indicate the presence of fungus such as histoplasmosis, coccidioidomycosis, or blastomycoses. White blood cells called eosinophils may also be present.

Additional conditions under which the test may be performed:

Acute pulmonary eosinophilia (Loeffler's syndrome)
Coccidioidomycosis; acute (primary) pulmonary
Coccidioidomycosis; disseminated

What the risks are Return to top

There are no risks.

Special considerations Return to top

Not applicable.

Update Date: 1/26/2004

Updated by: Daniel Levy, M.D., Ph.D., Infectious Diseases, Greater Baltimore Medical Center, Baltimore, MD. Review provided by VeriMed Healthcare Network.

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