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What is this test?

The Aspergillus fumigatus antibody test is a blood test that looks for antibodies (immune proteins) that your body produces in response to infection by Aspergillus fumigatus, a common mold found in soil, decaying vegetation, and indoor environments. This test specifically measures IgG and IgM antibodies against this fungus.

Why do I need this test?

Your healthcare provider may order this test if you have symptoms of a respiratory infection that hasn't responded to standard antibiotics, such as persistent cough, fever, chest pain, or difficulty breathing. It is particularly important for people with weakened immune systems, including organ transplant recipients, patients undergoing chemotherapy, people with HIV/AIDS, or those with chronic lung diseases like asthma or COPD.

How is the test performed?

A healthcare professional will draw a small blood sample from a vein in your arm. The sample is then sent to a laboratory where it is analyzed using specialized techniques to detect the presence and quantity of Aspergillus fumigatus-specific antibodies. You do not need to fast or make any special preparations before this test.

What do the results mean?

Results are typically reported as positive or negative, or as an antibody titer (a measure of how much antibody is present). A positive result indicates that you have been exposed to Aspergillus fumigatus and have developed antibodies. However, a positive test does not always mean you have an active infection—it may indicate past exposure. Your healthcare provider will interpret your results in context with your symptoms, medical history, and other test findings.