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.
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.
No special preparation is necessary for this test.
There will be a brief sting as a needle is inserted just below the skin surface.
This test is used to determine if a person has been exposed to the fungus that causes histoplasmosis.
No reaction (inflammation) at the site of the test is normal. Of note, the skin test can sometimes make histoplasmosis antibody tests turn positive.
A reaction means you have been exposed to Histoplasma capsulatum.
There is a slight risk of anaphylactic shock (a severe reaction).
This test is rarely used today. It has been replaced by a variety of blood and urine tests.