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Food Allergen Mix 3 IgE, Serum — Radioallergosorbent Assay (RAST)

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

A blood-based panel that measures IgE antibodies to a group of food allergens. It may help identify foods associated with an allergic reaction.

Quick summary

["This panel looks for food-specific IgE antibodies, but results must be interpreted alongside your symptoms and exposure history."]

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

Key facts at a glance

LOINC
82069-6
Short code
Food Allerg Mix3 IgE RAST
Synonyms
Food Allerg Mix3 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 to a panel of food allergens. RAST is an older name commonly used for this type of food allergy testing.

Why might I need this test?

You may need this test if you have symptoms such as hives, swelling, wheezing, vomiting, or digestive discomfort after eating certain foods. Your clinician uses the results together with your reaction history to assess which foods might be involved.

How is the test performed?

A blood sample is collected and tested in a laboratory for IgE antibodies against the allergens included in the panel. The laboratory may use a modern automated immunoassay even though the test is often called RAST.

How do I prepare for the test?

Fasting is usually not required, but follow your clinician's or laboratory's instructions. Tell your clinician about food reactions, recent avoidance, and medicines such as antihistamines, because these can affect interpretation; do not stop prescribed medicine without advice.

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 IgE panel 3

Frequently asked questions

Does a positive result mean I am allergic to that food?
Not necessarily. A positive result shows food-specific IgE, but some people have these antibodies without symptoms, so your clinician interprets the result with your history and examination.
Which foods are included in this panel?
The exact foods can vary by laboratory or test version. Check the laboratory report or ask your clinician for the allergen list before interpreting the results.
Should I stop taking antihistamines before the test?
Ask your clinician first. Antihistamines may reduce symptoms and make it harder to assess an allergy, but they generally do not directly change the IgE measurement, and prescribed medicines should not be stopped without guidance.
  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