Mold Allergen Mix 4 IgE Antibodies, Serum — RAST
A blood test that measures IgE antibodies to a panel of mold allergens, helping evaluate possible allergic sensitization.
["A positive result suggests sensitization to one or more tested molds but must be interpreted with symptoms and medical history."]
Key facts at a glance
- LOINC
- 82084-5
- Short code
- Mold Allerg Mix4 IgE RAST
- Synonyms
- Mold Allerg Mix4 IgE RAST
- 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
- Method
- multidisk
- 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, often called a RAST test, measures IgE antibodies directed against a mixture of mold allergens in a blood sample. IgE is an immune-system protein associated with allergic reactions.
Why might I need this test?
Your clinician may order this test if you have symptoms such as sneezing, congestion, wheezing, or eye irritation that might be related to mold exposure. It can also help evaluate suspected mold allergy or occupational exposure.
How is the test performed?
A blood sample is collected and analyzed in the laboratory for IgE antibodies to the mold allergens included in the test panel. Results are reported as a qualitative result or a measured antibody level, depending on the laboratory method.
How do I prepare for the test?
No special preparation is usually required. Tell your clinician about any antihistamines or other allergy medicines you take and about allergen immunotherapy, because these can affect interpretation; do not stop prescribed medication without advice.
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.
Detectable IgE to a tested mold indicates immune sensitization, but it does not by itself confirm that mold is causing your symptoms. Results should be compared with your exposure history, symptoms, physical examination, and other allergy tests. A positive result may persist even when allergy is not clinically significant.
Short name
Mold Allergen Mix 4 IgE Test
Frequently asked questions
Does a positive result mean I am allergic to mold?
Can this test identify the exact mold causing my symptoms?
Do I need to avoid mold before taking 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