Food Allergen Mix 70 IgE, Serum — Radioallergosorbent Test (RAST)
A blood test that measures IgE antibodies to a broad panel of 70 food allergens to help identify possible food sensitization.
["This test screens for IgE antibodies to many foods, but a positive result does not always mean a food allergy."]
Key facts at a glance
- LOINC
- 82071-2
- Short code
- Food Allerg Mix70 IgE RAST
- Synonyms
- Food Allerg Mix70 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?
The Food Allergen Mix 70 IgE test, also called a radioallergosorbent test or RAST, is a blood test that screens for IgE antibodies directed against a panel of 70 common food allergens. It is used to help identify foods that may trigger an immediate allergic reaction.
Why might I need this test?
Your clinician may order this test if you have symptoms such as hives, swelling, wheezing, vomiting, or other reactions after eating certain foods. It may also be used when the specific food or foods causing a reaction are unclear.
How is the test performed?
A blood sample is collected and tested in a laboratory for allergen-specific IgE antibodies. The report identifies which food allergens show a measurable antibody response.
How do I prepare for the test?
No special preparation is usually required. Tell your clinician about your symptoms, suspected foods, allergic conditions, medications, and any recent avoidance of a suspected allergen, because these details affect interpretation.
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 the immune system has produced IgE antibodies to one or more tested foods, which is consistent with sensitization. It does not by itself prove that eating that food will cause an allergic reaction. Results should be interpreted with your symptoms, medical history, and, when needed, additional allergy testing.
Short name
Food Allergen Mix 70 IgE
Frequently asked questions
Does a positive result mean I have a food allergy?
What symptoms can food allergies cause?
Is this 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