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    Histoplasma skin test

    Histoplasma skin test is a method to check if you have been exposed to a fungus called Histoplasma capsulatum. The fungus causes an infection called histoplasmosis.

    How the Test is Performed

    The health care provider will clean an area of your skin, usually the forearm. An allergen is injected just below the cleaned skin surface. The injection site is checked at 24 hours and at 48 hours for signs of a reaction. Occasionally, the reaction may not appear until the fourth 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

    This test is used to determine if a person has been exposed to the fungus that causes histoplasmosis.

    Normal Results

    No reaction (inflammation) at the site of the test is normal. The skin test can sometimes make histoplasmosis antibody tests turn positive.

    Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your doctor about the meaning of your specific test results.

    What Abnormal Results Mean

    A reaction means you have been exposed to Histoplasma capsulatum. It does not always mean you have an active infection.

    Risks

    There is a slight risk of anaphylactic shock (a severe reaction).

    Considerations

    This test is rarely used today. It has been replaced by a variety of blood and urine tests.

    References

    Deepe GS Jr. Histoplasma capsulatum. In: Mandell GL, Bennett JE, Dolin R, eds. Principles and Practice of Infectious Diseases. 7th ed. Philadelphia, Pa: Elsevier Churchill Livingstone; 2009:chap 264.

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          Tests for Histoplasma skin test

          Review Date: 8/24/2011

          Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; and Jatin M. Vyas, MD, PhD, Assistant Professor in Medicine, Harvard Medical School, Assistant in Medicine, Division of Infectious Disease, Department of Medicine, Massachusetts General Hospital. 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. 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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          St. Luke's Hospital - 232 South Woods Mill Road - Chesterfield, MO 63017 Main Number: 314-434-1500 Emergency Dept: 314-205-6990 Patient Billing: 888-924-9200
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