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Sputum smear (KOH test)

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Sputum test

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Sputum smear (KOH test)

Definition:

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

Alternative Names:
KOH test; Fungal smear

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How the test is performed:

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:

There is no special preparation.

How the test will feel:

There is no discomfort.

Why the test is performed:

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

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