Mold Allergen Mix 1 IgE, Serum — Radioallergosorbent Test (RAST)
A blood test that measures IgE antibodies to a panel of mold allergens, helping evaluate possible allergic sensitization to molds.
["Elevated IgE to a mold allergen may support an allergy diagnosis, but it must be interpreted alongside your symptoms and exposure history."]
Key facts at a glance
- LOINC
- 24485-5
- Short code
- Mold Allerg Mix1 IgE RAST
- Synonyms
- Mold Allerg Mix1 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 blood test measures allergen-specific IgE antibodies to a mixture of molds. The exact molds included may vary by laboratory. It is commonly used when respiratory symptoms such as sneezing, congestion, wheezing, or cough could be related to mold exposure.
Why might I need this test?
Your clinician may order this test to evaluate suspected mold allergy or to help identify which mold allergens trigger a reaction. The results are most useful when compared with your symptoms, medical history, and possible exposure to damp or moldy environments.
How is the test performed?
A blood sample is drawn and tested in the laboratory for IgE antibodies against the mold allergens in the panel. RAST is an in vitro allergy-testing method; it does not require directly exposing you to mold.
How do I prepare for the test?
Fasting is usually not required for this test. Tell your clinician about any medicines you take and whether you recently stopped an allergy medication, because treatment decisions should be guided by your clinician's instructions.
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 your immune system has produced IgE antibodies to one or more molds in the panel, which is consistent with sensitization. This does not by itself prove that mold exposure is causing your symptoms or predict the severity of a reaction. Results should be interpreted with your exposure history, symptoms, and other allergy tests by your clinician.
Short name
Mold Allergen Mix 1 IgE
Frequently asked questions
Does a positive result mean I have a mold allergy?
Can this test tell me which specific mold causes 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