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What is this test?

The Aspergillus fumigatus IgG Antibody test is a blood test that detects the presence of IgG (immunoglobulin G) antibodies specifically directed against Aspergillus fumigatus, a type of fungus commonly found in the environment. The test uses a method called Radioallergosorbent test (RAST) to identify these antibodies in your blood serum.

Why do I need this test?

Your healthcare provider may order this test if you have symptoms of a fungal allergy or infection, particularly affecting the lungs. This test helps diagnose conditions such as Allergic Bronchopulmonary Aspergillosis (ABPA), which is an allergic reaction to Aspergillus fungi that can cause wheezing, coughing, and breathing difficulties. It may also be used to monitor certain fungal infections or assess exposure to Aspergillus in people with weakened immune systems.

How is the test performed?

A healthcare professional will draw a small sample of blood from a vein in your arm. The blood sample is then sent to a laboratory where it is analyzed using the RAST method to detect the presence and quantity of IgG antibodies against Aspergillus fumigatus. No special preparation is typically required before the test.

What do the results mean?

Results are typically reported as positive or negative for the presence of IgG antibodies. A positive result means that IgG antibodies against Aspergillus fumigatus were detected in your blood, indicating that your immune system has been exposed to this fungus at some point. Your healthcare provider will interpret these results in conjunction with your symptoms, medical history, and other test results to make an accurate diagnosis.