KOH (Potassium Hydroxide) Test for Thrush
The sample is then placed on a slide with potassium hydroxide (KOH) solution and gently heated. This solution slowly dissolves the skin cells but not the yeast cells. The yeast cells can then be seen with a microscope. Color stains may be used so that the yeast cells are easier to see.
Why It Is Done
If a person has white patches in the mouth or on the tongue, a KOH test may be done to find out whether the person has thrush.
Findings of a KOH test may include the following.
No yeast or other fungi are present in the sample from the person's mouth.
Yeast or other fungi are present in the sample from the person's mouth.
What To Think About
In general, a KOH test is not needed to diagnose thrush. A doctor usually can diagnose thrush by looking at the white patches in a person's mouth.
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