Hospital Virtual Tour

Skin lesion KOH exam - Overview

Alternative Names

Potassium hydroxide examination of skin lesion; Fungal wet prep

Definition of Skin lesion KOH exam:

The skin lesion KOH exam is a test to diagnose a fungal infection of the skin.

How the test is 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 the test will feel:

You may feel pressure when the doctor scrapes the lesion off your skin.

Why the test is performed:

This test is done to diagnose a fungal infection of the skin.

Viral lesion culture

Reviewed last on: 4/15/2009
Jonathan Kantor, M.D., North Florida Dermatology Associates, Jacksonville, FL. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.

Home > Medical Reference > Encyclopedia (English)