Skin lesion KOH exam
Alternate Names : Potassium hydroxide examination of skin lesion, Fungal wet prep
Definition
The skin lesion KOH exam is a test to diagnose a fungal infection of the skin.
Why is the Test Performed?
This test is done to diagnose a fungal infection of the skin.
How is the Test Performed?
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.
How to Prepare for the Test?
There is no special preparation for the test.
How will the Test Feel?
You may feel pressure when the doctor scrapes the lesion off your skin.
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