Regional Allergen Mix 5–Specific IgE (RAST), Serum
A blood test that measures IgE antibodies to a regional group of common allergens. It may help identify which allergens are associated with allergy symptoms.
["This test can help link allergy symptoms to specific regional allergens by measuring IgE antibodies in blood."]
Key facts at a glance
- LOINC
- 82112-4
- Short code
- Region Allerg Mix5 IgE RAST
- Synonyms
- Region Allerg Mix5 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 is an allergy blood test known as a RAST test. It measures allergen-specific IgE antibodies against a group of allergens commonly found in a particular geographic region. The exact allergens included can vary by laboratory.
Why might I need this test?
Your clinician may order this test to help evaluate sneezing, wheezing, congestion, hives, or other possible allergy symptoms. It can be useful when skin testing is difficult, cannot be performed safely, or has not provided enough information.
How is the test performed?
A blood sample is collected and analyzed in the laboratory for IgE antibodies to the allergens in the regional mix. The results are usually reported as positive or negative for each included allergen.
How do I prepare for the test?
No special preparation is usually required for this blood test. Tell your clinician about any allergy medicines or treatments you are using, and do not stop them without medical 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.
A positive result shows that IgE antibodies to one or more included allergens are present, but it does not by itself prove that the allergen causes your symptoms. Results should be interpreted with your symptoms, medical history, exposure patterns, and any other allergy testing your clinician recommends.
Short name
Regional Allergen Mix 5 IgE
Frequently asked questions
Does a positive result mean I am allergic to every allergen in the panel?
Can this test be used when I am taking antihistamines?
Is a blood allergy test the same as a skin-prick 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