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Lifespan’s A - Z Health Information Library |
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Skin lesion KOH examDefinitionThe skin lesion KOH exam is a test to diagnose a fungal infection of the skin. Alternative NamesPotassium hydroxide examination of skin lesion; Fungal wet prep How the Test is PerformedThe 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 TestThere is no special preparation for the test. How the Test Will FeelYou may feel pressure when the doctor scrapes the lesion off your skin. Why the Test is PerformedThis test is done to diagnose a fungal infection of the skin. Normal ResultsNormally, there is no fungus. What Abnormal Results MeanThe KOH smear shows fungus, which may be related to ringworm, athlete's foot, jock itch, or another fungal infection. RisksThere is a small risk of bleeding or infection from scraping the lesion. Review Date: 4/15/2009
Reviewed By: 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.
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