Aspergillus-Specific IgE Antibody, Qualitative
A qualitative blood test that detects IgE antibodies to Aspergillus, which may indicate sensitization to this mold.
["A positive result suggests an immediate allergic sensitization to Aspergillus but must be interpreted with symptoms and medical history."]
Key facts at a glance
- LOINC
- 43862-2
- Short code
- Deprecated Aspergillus IgE RAST Ql
- Synonyms
- Deprecated Aspergillus 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 looks for Aspergillus-specific IgE antibodies in a blood sample. IgE is an immune-system protein associated with immediate allergic reactions.
Why might I need this test?
It may be ordered when a person has asthma, cystic fibrosis, recurrent lung symptoms, or other possible allergy-related problems after exposure to Aspergillus mold.
How is the test performed?
A blood sample is collected and analyzed in a laboratory for Aspergillus-specific IgE. The result is reported as positive or negative, depending on whether the antibodies are detected.
How do I prepare for the test?
No special preparation is usually required. If you are taking allergy medicines or other medicines that affect immune responses, tell your clinician, but do not stop any medicine unless instructed.
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 the immune system has produced IgE directed against Aspergillus, suggesting sensitization to this mold. This can occur in allergic bronchopulmonary aspergillosis and may also be found in people with asthma or other allergic conditions. A negative result does not completely exclude Aspergillus allergy, so results should be interpreted with symptoms, examination findings, and other tests.
Short name
Aspergillus IgE Antibody
Frequently asked questions
Does a positive result mean I have an Aspergillus allergy?
What symptoms may lead to this test being ordered?
Can I take allergy medicines before the test?
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