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What is this test?

The Aspergillus fumigatus antibody test is a blood test that detects whether your body has produced antibodies (also called immunoglobulins) against Aspergillus fumigatus, a common type of fungus found in soil, decaying vegetation, and indoor environments. The test uses a laboratory method called immune diffusion (ID), which allows healthcare providers to identify whether you have been exposed to this fungus.

Why might I need this test?

Your healthcare provider may order this test if you have symptoms of a respiratory infection that hasn't responded to typical treatments, or if you have a weakened immune system. People with asthma, cystic fibrosis, or compromised immune systems (such as those with HIV/AIDS, organ transplant recipients, or patients undergoing chemotherapy) are at higher risk for aspergillosis and may need this test to help diagnose the infection.

What do the results mean?

The test results are typically reported as either positive or negative. A positive result means that antibodies to Aspergillus fumigatus were detected in your blood, which suggests you have been exposed to the fungus. This could indicate a current infection, a past infection, or sometimes a harmless colonization. A negative result means no antibodies were detected, which could mean you have not been exposed to the fungus, or that the infection is very recent and antibodies haven't yet developed. Your healthcare provider will interpret these results together with your symptoms, medical history, and other test findings.