Food Allergen Mix 15 IgE, Serum — Radioallergosorbent Test (RAST)
A blood test that measures IgE antibodies to a panel of 15 food allergens, helping identify possible food-related sensitization.
["A positive result suggests an immune reaction to one or more foods in the panel, but it must be interpreted alongside symptoms and other allergy testing."]
Key facts at a glance
- LOINC
- 82057-1
- Short code
- Food Allerg Mix15 IgE RAST
- Synonyms
- Food Allerg Mix15 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 15 IgE test measures allergy-specific IgE antibodies to a group of 15 foods. The exact foods included may vary by laboratory, so review the test report or ask the laboratory which allergens were tested.
Why might I need this test?
This test may be used to evaluate suspected food allergies, especially when symptoms occur after eating and the cause is unclear. It can help identify foods that may warrant follow-up testing or an allergy specialist's evaluation.
How is the test performed?
A blood sample is drawn and tested in the laboratory for IgE antibodies against the foods in the panel. The RAST name refers to the radioallergosorbent testing approach, although many laboratories use automated immunoassay methods.
How do I prepare for the test?
Fasting is generally not required for this blood test. Continue prescribed medicines unless your healthcare professional tells you otherwise, and tell the clinician about any food reactions, symptoms, and allergy 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 IgE result indicates sensitization to one or more foods in the panel. It does not by itself prove that eating a particular food will cause a harmful reaction, because clinical allergy depends on symptoms, the food consumed, and other factors. Results should therefore be interpreted with your medical history, and sometimes confirmed with individualized testing or a supervised food challenge.
Short name
Food Allergen Mix 15 IgE
Frequently asked questions
Does a positive result mean I have a food allergy?
What if the test is negative?
Should I stop eating a food after a positive result?
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