Epidermal Allergen Mix 72 IgE, Serum — Radioallergosorbent Test (RAST)
Measures IgE antibodies to a panel of common airborne allergens in blood to help identify possible triggers of allergy symptoms.
["This blood test can show whether you have IgE-mediated sensitization to common inhaled allergens."]
Key facts at a glance
- LOINC
- 82049-8
- Short code
- Epid Allerg Mix72 IgE RAST
- Synonyms
- Epid Allerg Mix72 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. It evaluates reactions to a panel of common airborne substances, such as pollen, dust mites, mold, and animal dander, and may include other environmental allergens.
Why might I need this test?
Your clinician may order it to investigate sneezing, congestion, wheezing, or other symptoms that may be caused by an environmental allergy. The results can help identify likely triggers and guide treatment or avoidance decisions.
How is the test performed?
A blood sample is drawn and tested for IgE antibodies against the allergens in the panel. RAST is an older term for this type of allergen-specific antibody testing, which is also commonly called serum-specific IgE testing.
How do I prepare for the test?
Fasting is usually not required. Tell your clinician about any allergy medicines, biologic treatments, or recent immunotherapy, because these may affect the results. Do not stop prescribed medicines unless your clinician advises you to do so.
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 IgE sensitization to the particular allergen being tested, but it does not by itself prove that the allergen causes your symptoms. Your healthcare professional will interpret each result alongside your exposure history and symptoms. A negative or undetectable result makes an IgE-mediated allergy to the tested allergens less likely but does not rule out every type of allergy.
Short name
Epidermal Allergen-Specific IgE Panel (RAST)
Frequently asked questions
What does a positive RAST result mean?
Is this the same as a skin-prick test?
Can medication affect the results?
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