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Alternative names Return to top
Potassium hydroxide examination of skin lesion; Fungal wet prepDefinition Return to top
The skin lesion KOH exam is a test to diagnose a fungal infection of the skin.How the test is performed Return to top
The lesion is scraped, using a blunt edge such as the edge of a microscope slide. The scrapings from the skin lesion are placed in a solution of potassium hydroxide (KOH) and examined under the microscope. The fungus can be seen, if present. This is different from a saline (salt water) examination, since the KOH destroys all non-fungal cells, making it much easier to see the fungal material.How to prepare for the test Return to top
There is no special preparation for the test.How the test will feel Return to top
You may feel a pressure sensation when the lesion is scraped from the skin.Why the test is performed Return to top
The test is performed when fungal infections of the skin are suspected.Normal Values Return to top
The lack of fungus is normal and expected.What abnormal results mean Return to top
The KOH smear shows hyphae or fungal organisms. This may indicate ringworm (tinea corporis), athlete's foot, jock itch, or many other fungal infections.
What the risks are Return to top
There is a small risk of bleeding or infection from scraping the lesion.Special considerations Return to top
Not applicable. Update Date: 10/27/2003 Updated by: Jeffrey Drayer, M.D., Dermatologist, Los Angeles, CA. Review provided by VeriMed Healthcare Network.
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Page last updated: 28 October 2004 |