Aspergillus fumigatus rAsp f3 IgE Antibody, Radioallergosorbent Test — Qualitative (Deprecated)
A blood test that detects IgE antibodies to Aspergillus fumigatus Asp f3, helping evaluate allergic sensitization; a positive result alone does not confirm allergy.
["A positive result shows sensitization to Aspergillus fumigatus Asp f3, but clinical symptoms and other findings are needed to determine whether allergy is likely."]
Key facts at a glance
- LOINC
- 51570-0
- Short code
- Deprecated A fumigatus (rAsp f) 3 IgE RAST Ql
- Synonyms
- Deprecated A fumigatus (rAsp f) 3 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 qualitative blood test measures IgE antibodies directed against Asp f3, a recombinant allergen from the fungus Aspergillus fumigatus. It is performed using a radioallergosorbent test method. This test is marked as deprecated, so its availability may be limited.
Why might I need this test?
This test may be used to evaluate suspected Aspergillus sensitization in people with respiratory symptoms, wheezing, or other symptoms that may be related to fungal exposure. It can also help assess whether a particular Aspergillus allergen is a possible trigger.
How is the test performed?
A blood sample is tested in the laboratory for antibodies that bind the recombinant Asp f3 allergen. The result is reported as positive or negative rather than with a quantitative measurement.
How do I prepare for the test?
No fasting or special preparation is usually required. Because this is a blood test and not a skin-prick test, antihistamines generally do not need to be stopped. Follow your healthcare provider's instructions and tell the laboratory if you have a history of allergic reactions to test materials.
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 Aspergillus fumigatus Asp f3 are present, suggesting sensitization to this fungus. Sensitization does not always mean that exposure causes symptoms, so the result must be interpreted with your medical history, symptoms, and other allergy or lung tests. A negative result may make this particular allergen less likely to be responsible, although it does not exclude sensitivity to other Aspergillus components.
Short name
Aspergillus fumigatus Asp f3-Specific IgE (RAST)
Frequently asked questions
Does a positive result mean I have an Aspergillus allergy?
Can this test diagnose allergic bronchopulmonary aspergillosis?
Why is the test listed as deprecated?
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