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Alternative Names:
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Potassium hydroxide examination of skin lesion
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How the test is performed:
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The health care provider scrapes the lesion off your skin, using a blunt edge such as the edge of a microscope slide. The scrapings from the skin lesion are placed in liquid containing potassium hydroxide (KOH) and examined under the microscope. KOH destroys all non-fungal cells, which makes it easier to see if there is any fungus present.
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How to prepare for the test:
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There is no special preparation for the test.
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How the test will feel:
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You may feel pressure when the doctor scrapes the lesion off your skin.
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Why the test is performed:
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This test is done to diagnose a fungal infection of the skin.
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Normal Values:
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Normally, there is no fungus.
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What the risks are:
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There is a small risk of bleeding or infection from scraping the lesion.
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