Fungus stain/fungal smear (KOH) is a test used to detect the presence of fungal elements in a clinical specimen. It is often used to diagnose fungal infections of the skin, hair, or nails, such as ringworm, athlete’s foot, or jock itch.
When this test is required
The test may be requested when a healthcare provider suspects that a person has a fungal infection of the skin, hair, or nails. It may also be used to monitor the effectiveness of treatment.
What the Test Detects
The test involves examining a clinical specimen under a microscope after treating it with potassium hydroxide (KOH) to dissolve any non-fungal material. The fungal elements are then visible under the microscope.
Preparation for the Test
There is no specific preparation needed for the test.
Sample Requirements
The test requires a clinical specimen, such as a skin scraping, nail clipping, or hair sample.
Additional Notes
The test is relatively quick and easy to perform, but it is not always sensitive or specific. False positive and false negative results can occur. The test should be interpreted in the context of the patient’s symptoms, clinical presentation, and other diagnostic test results.
