Aspergillus flavus-Specific IgE Antibody, Qualitative (RAST)
A blood test that checks for IgE antibodies directed against Aspergillus flavus, a mold that can cause allergic respiratory disease.
["A positive result indicates possible sensitization to A. flavus but does not by itself confirm an allergy."]
Key facts at a glance
- LOINC
- 82020-9
- Short code
- Deprecated A flavus IgE RAST Ql
- Synonyms
- Deprecated A flavus IgE RAST Ql
- Category
- liver
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 10
- Ref high
- 40
- Critical range
- — – 500 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 84484
- SNOMED
- 302774002
- 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?
This test detects IgE antibodies against Aspergillus flavus, a mold found in soil, dust, and decaying plant material. It is used to assess whether the immune system has become sensitized to this mold.
Why might I need this test?
It may be ordered for people with wheezing, coughing, recurrent sinus or lung symptoms, or unexplained allergic reactions who may have been exposed to A. flavus. Results are interpreted together with symptoms, exposure history, and other allergy testing.
How is the test performed?
A blood sample is collected and tested in the laboratory for allergen-specific IgE using an immunoassay. The result is reported as positive or negative, depending on whether a significant antibody response is detected.
How do I prepare for the test?
No special preparation is usually required. Tell your clinician about any medicines you take, especially antihistamines, and follow their instructions if they advise adjusting a medication before testing.
Reference range
Adult: 10-40 U/LN/A
No special preparation required. Avoid fatty meals before the test if possible.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
A positive result indicates that IgE antibodies to A. flavus are present, suggesting sensitization to this mold. This may support an allergy diagnosis when it matches the person's symptoms and exposure history, but it does not prove that the mold is causing those symptoms. A negative result reduces the likelihood of A. flavus sensitization but does not completely exclude it.
Short name
A. flavus-specific IgE
Frequently asked questions
Does a positive result mean I am allergic to Aspergillus flavus?
What symptoms can Aspergillus flavus cause?
Can this test be used to diagnose invasive fungal infection?
Sources
- 1
- 2Lab Tests OnlineSource
- 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 17, 2026. · Read our editorial policy