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Skin lesion KOH exam
Definition:
The skin lesion KOH exam is a test to diagnose a fungal infection of the skin. Alternative Names:
Potassium hydroxide examination of skin lesion; Fungal wet prep Text Continues Below
How the test is performed:
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 test 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:
There is no special preparation for the test. How the test will feel:
You may feel a pressure sensation when the lesion is scraped from the skin. Why the test is performed:
The test is performed when fungal infections of the skin are suspected.
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