Health Care Encyclopedia
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Histoplasma skin testDefinition: Histoplasma is an infection caused by a fungus that is usually found in the soil. Within the United States,�most cases occur in certain areas such as the Mississippi, Missouri, and Ohio River Valleys, and in Puerto Rico. The skin test detects exposure to the fungus.
How the test is performed: The test site (an area with hair, usually the forearm) is cleansed. The allergen is then injected just below the skin surface. The test is read at 24 hours and at 48 hours. Occasionally, the reactions may not be present until the 4th day.
How to prepare for the test: No special preparation is necessary for this test.
How the test will feel: There will be a brief sting as a needle is inserted just below the skin surface.
Why the test is performed: To see if the individual has been exposed to the fungus that causes histoplasmosis.
Normal Values: No reaction (inflammation) at the site of the test is normal. Of note, the skin test can sometimes make histoplasmosis antibody tests turn positive.
What abnormal results mean: The individual has been exposed to the microorganism that causes histoplasmosis.
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| Review Date: 10/27/2005
Reviewed By: Daniel Levy, M.D., Ph.D., Infectious Diseases, Greater Baltimore Medical Center, Baltimore, MD. Review provided by VeriMed Healthcare Network.
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