Allergen-Specific IgE, Serum — 73-Allergen Mix (RAST)
A blood test that measures IgE antibodies to multiple allergens in a 73-allergen panel, helping identify possible allergen sensitization.
["Results can show which allergens your immune system has reacted to, but they must be interpreted with your symptoms and medical history."]
Key facts at a glance
- LOINC
- 24488-9
- Short code
- Epid Allerg Mix73 IgE RAST
- Synonyms
- Epid Allerg Mix73 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. RAST is a laboratory term for a type of allergen-specific IgE testing, and this version tests a mix of 73 allergens.
Why might I need this test?
You may need this test if you have symptoms such as sneezing, wheezing, hives, swelling, or digestive discomfort that may be related to an exposure to food, pollen, dust mites, animal dander, insects, or other substances.
How is the test performed?
A blood sample is collected and sent to a laboratory, where the laboratory measures IgE antibodies to the allergens included in the panel. The results are reported for the individual allergens tested.
How do I prepare for the test?
Fasting is usually not required. Tell your clinician about any medicines you take, recent allergen exposure, and worsening of asthma or other allergic symptoms, but do not stop prescribed medicines 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 detectable or elevated result indicates sensitization to the particular allergen tested, meaning your immune system has produced IgE antibodies against it. A negative or undetectable result makes sensitization to that allergen less likely. These findings do not by themselves prove that a specific allergen causes your symptoms, so results should be interpreted alongside your history and, when appropriate, other allergy testing.
Short name
Allergen-Specific IgE (RAST)
Frequently asked questions
Does a positive result mean I am definitely allergic?
Can this test identify the cause of my symptoms?
Is this the same as a skin-prick allergy 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