In general, there's nothing you have to do before this test, unless your doctor tells you to.
How It Is Done
A doctor or nurse takes a sample by lightly scraping the infected area. Sometimes the doctor will use a swab.
The sample is then placed on a slide with potassium hydroxide (KOH) solution and is gently heated. This solution slowly dissolves the skin cells but not the fungus. The fungus can then be seen with a microscope. Colour stains may be used so that the fungus is easier to see.
How It Feels
You may feel a scraping sensation when the doctor or nurse takes the sample. The scraping takes only a few seconds.
It may be uncomfortable if a sample is scraped from under a fingernail or toenail, or if the area is sore, such as when you have thrush.
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