Understanding Your Medical Test: What It Is, How It Works, and What It Means for Your Health
This blood test detects antibodies against Aspergillus fumigatus, a common mold that can cause respiratory infections, particularly in people with weakened immune systems.
{"Measures antibodies (IgG) against Aspergillus fumigatus fungus in your blood","Helps diagnose aspergillosis, a fungal infection that primarily affects the lungs","Often ordered for patients with weakened immune systems, such as those undergoing chemotherapy or with HIV/AIDS","Results are reported as positive, negative, or equivocal (borderline)","A positive result indicates exposure to the fungus, but may not mean active infection"}
Key facts at a glance
- LOINC
- 44438-0
- Short code
- A fumigatus1 Ab Ser-aCnc
- Synonyms
- A fumigatus1 Ab Ser-aCnc
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 82784
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
What is this test, and what exactly does it measure or look for in my body?
The Aspergillus fumigatus antibody test is a blood test that detects whether your immune system has produced antibodies (specifically IgG) against Aspergillus fumigatus, one of the most common types of mold found in the environment. This fungus is widespread and can be found in soil, decaying vegetation, and even in indoor air. While most people breathe in Aspergillus spores regularly without getting sick, individuals with compromised immune systems are at risk of developing aspergillosis.
How is this test performed, and what should I expect during the procedure?
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 tested for the presence of IgG antibodies against Aspergillus fumigatus. The test is typically performed using enzyme immunoassay (EIA) or immunofluorescence methods. You do not need to fast or make any special preparations before this test.
What do my test results mean, and how will my doctor explain them to me?
Results are typically reported as positive, negative, or equivocal (sometimes called borderline). A positive result means that antibodies to Aspergillus fumigatus were detected in your blood, indicating that you have been exposed to this fungus at some point. However, a positive result does not necessarily mean you have an active infection—it may indicate a past exposure or colonization. Your healthcare provider will interpret your results in the context of your symptoms, medical history, and other test results.
Why might I need this test, and what symptoms or health conditions could make it necessary?
This test is commonly ordered for patients who have symptoms of a respiratory infection that may be caused by a fungus, especially if they have risk factors for invasive aspergillosis. Risk factors include: weakened immune systems from chemotherapy, organ transplantation, HIV/AIDS, long-term steroid use, or certain blood disorders. Symptoms that might prompt testing include fever, cough, shortness of breath, chest pain, or difficulty breathing that does not respond to standard antibiotic treatment.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
The Aspergillus fumigatus antibody test is primarily used to support the diagnosis of aspergillosis, particularly chronic forms such as chronic pulmonary aspergillosis (CPA) and allergic bronchopulmonary aspergillosis (ABPA). While the test is less useful for diagnosing acute invasive aspergillosis (which requires more rapid diagnostic approaches like antigen testing), it can still provide valuable information about prior exposure. In immunocompromised patients, a positive antibody result may indicate developing invasive disease and warrants further investigation with imaging (such as CT scans) and other diagnostic tests.
Clinical significance also includes monitoring treatment response in patients with chronic forms of aspergillosis. Rising antibody titers may indicate worsening disease, while declining levels may suggest effective therapy. The test is often used in conjunction with other laboratory markers and clinical assessment to guide treatment decisions.
Frequently asked questions
Is this test dangerous or painful?
Do I need to fast before this test?
How long does it take to get results?
What is the difference between this test and the Aspergillus antigen test?
Can a positive result mean I have an active infection?
Sources
- 1
- 2
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy