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Definition Return to top
Histoplasma is an infection caused by a fungus that is usually found in the soil. Within the United States, there is a high incidence of infection 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 Return to top
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 Return to top
No special preparation is necessary for this test.How the test will feel Return to top
There will be a brief sting as a needle is inserted just below the skin surface.Why the test is performed Return to top
To see if the individual has been exposed to the fungus that causes histoplasmosis.Normal Values Return to top
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 Return to top
The individual has been exposed to the microorganism that causes histoplasmosis.What the risks are Return to top
There is a slight risk of anaphylactic shock (a severe reaction). Update Date: 11/18/2003 Updated by: D. Scott Smith, MD, MSc, DTM&H, Infectious Diseases Division and Dept. of Microbiology and Immunology, Stanford University Medical School, Stanford, CA. Review provided by VeriMed Healthcare Network.
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Page last updated: 28 October 2004 |