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What is this test?

The Aspergillus fumigatus antibody test is a blood test that detects the presence of IgG antibodies against Aspergillus fumigatus, a common airborne mold. This test helps determine if your immune system has been exposed to this fungus. It is primarily used to support the diagnosis of allergic bronchopulmonary aspergillosis (ABPA) and other forms of aspergillosis.

Why is this test performed?

This test is typically ordered when patients with asthma, cystic fibrosis, or other respiratory conditions experience worsening symptoms that may be related to an Aspergillus infection. It helps doctors distinguish between simple asthma exacerbation and allergic bronchopulmonary aspergillosis, which requires specific treatment.

What do the results mean?

A positive result indicates that antibodies against Aspergillus fumigatus were detected in your blood. This means you have been exposed to the mold at some point. However, a positive result does not always mean you have an active infection. Your doctor will interpret the results along with your symptoms, chest X-ray findings, and other laboratory tests to make an accurate diagnosis. A negative result suggests no detectable antibodies, but does not completely rule out Aspergillus-related conditions.

How is the test done?

A healthcare professional will draw a small blood sample from a vein in your arm. The sample is then sent to a laboratory for analysis. No special preparation is needed before the test.