: Aspergillus niger IgE Antibody, Serum
: This test measures immunoglobulin E (IgE) antibodies in the blood that are specific to the mold Aspergillus niger. It is used to help assess whether a person has become sensitized to this mold and may be having allergy-related symptoms.
[": A positive result suggests sensitization to Aspergillus niger, but it must be interpreted together with symptoms and other clinical information."]
Key facts at a glance
- LOINC
- 102154-2
- Short code
- ASPNGIGE
- Synonyms
- A niger IgE RAST
- Category
- chemistry
- Sample
- serum
- Container
- Serum separator tube (SST) or red top tube
- Units
- N/A
- Ref low
- 0.35
- Ref high
- 0.69
- Critical range
- — – 500 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- ≥ 0 years
- Method
- Radioallergosorbent test (RAST)
- CPT
- 86003
- SNOMED
- 40911000119109
- Specimen volume
- 1 mL serum (minimum 0.5 mL)
- Stability
- Stable for 7 days at 2-8°C; for longer storage, freeze at -20°C or below
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 24–72 hours
- Order
- routine
: What This Test Measures
: The test detects and measures the amount of IgE antibody directed against Aspergillus niger, a common environmental mold. IgE is the antibody type involved in immediate allergic reactions. This is not a general IgE test and not a measurement of total antibody levels.
: Why It Is Ordered
: A healthcare provider may order this test when a person has allergy or asthma-like symptoms that could be triggered by mold exposure. It can help support a diagnosis of mold sensitivity and guide decisions about avoidance, treatment, and further evaluation.
: How the Sample Is Collected
: A blood sample is drawn from a vein, usually in the arm, and the serum is separated for analysis. The test is performed in a laboratory using an immunoassay method. No special preparation is typically required unless your provider says otherwise.
: How to Interpret Results
: Results are generally reported as a level or class of specific IgE. Higher values suggest greater sensitization, but the test does not by itself prove that mold is causing your symptoms. Your provider will interpret the result alongside your history, environment, and other tests.
Reference range
Negative: <0.35 kU/L; Equivocal: 0.35-0.69 kU/L; Positive: ≥0.70 kU/LN/A
No fasting required. Patient should discontinue antihistamine use only if skin prick testing is also planned (not required for serum IgE testing). Inform provider of any recent immunotherapy.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
: Specific IgE testing for Aspergillus niger can support the evaluation of mold-related allergy. Sensitization does not always mean clinical allergy, and a negative result does not completely rule out sensitivity. Results should be reviewed by a qualified healthcare professional in the context of symptoms and exposure history.
Short name
: A. niger IgE
Frequently asked questions
: Does a positive result mean I am allergic to this mold?
: Do I need to fast before this test?
: Can this test tell me how much mold is in my home?
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