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What is this test?

The Aspergillus fumigatus IgG antibody test is a blood test that detects and measures Immunoglobulin G (IgG) antibodies directed against Aspergillus fumigatus, a common type of mold found in the environment. The presence of these antibodies in your blood indicates that your immune system has been exposed to this fungus.

What is Aspergillus fumigatus?

Aspergillus fumigatus is one of the most common species of mold found worldwide. It lives in soil, decaying vegetation, and building materials. Most people breathe in these spores daily without getting sick. However, in people with weakened immune systems, asthma, or cystic fibrosis, this fungus can cause infections ranging from allergic reactions to severe lung disease.

Why do I need this test?

Your healthcare provider may order this test if you have symptoms of aspergillosis such as fever, cough, wheezing, shortness of breath, chest pain, or unexplained weight loss. It is particularly useful for diagnosing chronic pulmonary aspergillosis, allergic bronchopulmonary aspergillosis (ABPA), and aspergilloma (fungal ball). The test helps differentiate between these conditions and monitors how well treatment is working.

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 tested for the presence and quantity of IgG antibodies against Aspergillus fumigatus. No special preparation such as fasting is typically required before this test.

Understanding your results

Results are usually reported as positive, negative, or in some cases, as a numerical value (titer). A positive result suggests that you have been exposed to Aspergillus fumigatus and may have an active, chronic, or past infection. Your doctor will interpret these results together with your symptoms, imaging studies, and other laboratory tests to make an accurate diagnosis.