KOH test

KOH test is a quick and cost-effective method used in medicine to diagnose fungal infections of the skin, hair, and nails. The test is named after the chemical used in the procedure, potassium hydroxide (KOH).

Procedure

The KOH test involves scraping the affected area of the skin, hair, or nails and placing the sample on a microscope slide. A few drops of a solution containing KOH are added to the sample. The slide is then gently heated, which dissolves the cells but leaves the fungal cells intact. The slide is examined under a microscope to identify the presence of fungal cells.

Uses

The KOH test is primarily used to diagnose:

• Tinea pedis (athlete's foot)
• Tinea corporis (ringworm)
• Tinea capitis (scalp ringworm)
• Tinea unguium (fungal nail infection)
• Candidiasis (yeast infection)

Advantages and Disadvantages

The main advantage of the KOH test is its speed and cost-effectiveness. The test can be performed quickly in a doctor's office or a lab, and the results are available immediately. However, the test may not always be accurate. It may not detect a fungal infection if the number of fungal cells in the sample is low. It may also give a false positive result if the sample is contaminated with other types of cells.

See Also

• Dermatology
• Mycology
• Clinical pathology

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