Regional Allergen Mix 3 IgE Antibodies, Serum — Radioallergosorbent Test (RAST)
A blood test that measures IgE antibodies to allergens contained in a regional allergen mixture, helping identify possible allergic sensitization.
["A positive result suggests possible allergy-related sensitization to one or more allergens in the tested mixture."]
Key facts at a glance
- LOINC
- 82106-6
- Short code
- Region Allerg Mix3 IgE RAST
- Synonyms
- Region Allerg Mix3 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 measures allergen-specific IgE antibodies in your blood using a mixture of allergens commonly found in a particular region. IgE is an immune-system protein that can develop in response to an allergen.
Why might I need this test?
Your clinician may order this test to help evaluate suspected allergy symptoms such as sneezing, wheezing, hives, or swelling. It can help identify whether your immune system reacts to allergens in the tested regional mixture.
How is the test performed?
A blood sample is collected and analyzed in the laboratory for IgE antibodies against the allergens in the mixture. The result is usually reported as positive or negative, sometimes with a numerical value.
How do I prepare for the test?
No special preparation is usually required, and you can generally continue taking medicines unless your clinician gives different instructions. Tell the healthcare professional drawing the blood if you have recently used allergy medicines or biologic treatments.
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 at least one allergen in the tested mixture are present. This supports possible allergic sensitization, but it does not by itself confirm that a specific allergen causes your symptoms. Your clinician should interpret the result alongside your history, examination, and any other allergy testing.
Short name
Regional Allergen Mix 3 IgE (RAST)
Frequently asked questions
Does a positive result mean I am allergic to every allergen in the mixture?
Can this test explain my allergy symptoms?
Should I stop taking allergy medicine 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