MedlinePlus Medical Encyclopedia: Aspergillus antigen skin test

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Aspergillus antigen skin test

Contents of this page:
Illustrations Alternative Names Definition How the Test is Performed How to Prepare for the Test How the Test Will Feel	Why the Test is Performed Normal Results What Abnormal Results Mean Risks Considerations

Illustrations

Aspergillus antigen skin test

Alternative Names Return to top

Immediate Aspergillus skin test

Definition Return to top

Aspergillus is a mold. An antigen is a substance that stimulates the immune system to eliminate or fight foreign substances in the body. This skin test detects hypersensitivity to aspergillus.

How the Test is Performed Return to top

The test site (an area with hair, usually the forearm) is cleansed. The antigen is then injected into the area. If there is a positive reaction, the area should turn red and develop a lump (similar to a mosquito bite) within ten minutes of injection. The lump should be at least 3 millimeters in diameter to be considered positive.

How to Prepare for the Test Return to top

There is no special preparation necessary.

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

The test is to detect hypersensitivity to the mold aspergillus.

Normal Results Return to top

A negative reaction or no inflammation at the test site is normal.

What Abnormal Results Mean Return to top

If a positive reaction occurs (the test site is inflamed), you are hypersensitive to the aspergillus mold. You may have the disease known as pulmonary aspergillosis.

Risks Return to top

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

Considerations Return to top

Not applicable.

Update Date: 2/10/2006

Updated by: Kenneth Wener, M.D., Division of Infectious Diseases, Beth Israel Deaconess Medical Center, Boston, MA. Review provided by VeriMed Healthcare Network.

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