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Food Allergen Mix 28 IgE Antibodies, Serum

Published: August 9, 2026Updated: August 17, 2026

A blood test that screens for IgE antibodies to a mixture of 28 food allergens, helping identify possible food allergy sensitization.

Quick summary

["A positive result suggests sensitization to one or more foods in the panel but must be interpreted with your symptoms and medical history."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
82066-2
Short code
Food Allerg Mix28 IgE RAST
Synonyms
Food Allerg Mix28 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 to a mixture of 28 foods in a blood sample. It is a broad screening test for possible IgE-mediated food allergy; it does not identify which single food is responsible.

Why might I need this test?

Your clinician may order it to evaluate suspected food allergy, especially if you have symptoms such as hives, swelling, wheezing, vomiting, or other reactions after eating. It may also help guide follow-up testing for the individual foods that appear most relevant.

How is the test performed?

A blood sample is collected and analyzed in the laboratory, usually with an immunoassay. Because many allergens are tested together, additional testing for individual foods may be needed.

How do I prepare for the test?

No special preparation is usually required. Antihistamines and some other medicines can affect IgE test results, so tell your clinician about all medicines and supplements you use. Do not stop prescribed medicines unless your clinician advises you to do so.

Reference range

Adult: 10-40 U/LN/A

Specimen: serum

No special preparation required. Avoid fatty meals before the test if possible.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Food Allergen Mix 28 IgE

Frequently asked questions

Does a positive result mean I am allergic to every food in the panel?
No. The panel contains many foods, and a positive result does not mean you react to all of them or necessarily to any of them. Your clinician will interpret the result alongside your symptoms and may order tests for specific foods.
Can I use this test to diagnose a food allergy?
It is a screening test rather than a stand-alone diagnosis. A food allergy is generally diagnosed using the test results together with a detailed symptom history and, when needed, additional allergy testing or supervised food challenges.
What if the test is negative?
A negative result means IgE to the foods in this panel was not detected at the laboratory's testing limit. Some reactions are not IgE-mediated or may involve foods not included in the panel, so discuss ongoing symptoms with your clinician.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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