Food Allergen Mix 22-Specific IgE (RAST), Serum
Measures IgE antibodies to a panel of 22 foods in serum to help evaluate possible food allergy. Results indicate sensitization and must be interpreted with symptoms and medical history.
["This blood test can identify foods to which your immune system has developed IgE antibodies."]
Key facts at a glance
- LOINC
- 82099-3
- Short code
- Food Allerg Mix22 IgE RAST
- Synonyms
- Food Allerg Mix22 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 blood test measures food-specific IgE antibodies using a panel of 22 foods. IgE is an immune-system protein that can react with allergens, and the laboratory method is commonly called RAST.
Why might I need this test?
A clinician may order this test when you have symptoms such as hives, swelling, wheezing, vomiting, or digestive discomfort after eating certain foods. It may also be used to evaluate suspected food allergy or guide allergy testing.
How is the test performed?
A blood sample is drawn from a vein and sent to a laboratory. The laboratory tests the sample for IgE antibodies directed against the foods included in the panel.
How do I prepare for the test?
No special preparation or fasting is usually required. Tell your clinician about your symptoms, suspected foods, allergic conditions, medications, and any recent changes in your diet.
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.
Detectable food-specific IgE indicates immune sensitization to one or more tested foods, but it does not by itself prove that eating the food will cause an allergic reaction. Results are most useful when compared with the foods you avoid, the timing of your symptoms, and other allergy evaluations. A clinician should interpret the panel and determine whether follow-up testing or an allergy evaluation is appropriate.
Short name
Food Allergen-Specific IgE Panel, Serum
Frequently asked questions
Does a positive result mean I am allergic to that food?
Why were 22 foods tested together?
Should I avoid all foods with positive 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