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Food Allergen Mix 24 IgE — Radioallergosorbent Test (RAST)

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

A blood test that screens for IgE antibodies to a panel of 24 food allergens, helping identify possible food sensitivities.

Quick summary

["Results can point to food sensitization, but your symptoms and medical history are needed to determine whether a food allergy is likely."]

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

Key facts at a glance

LOINC
82063-9
Short code
Food Allerg Mix24 IgE RAST
Synonyms
Food Allerg Mix24 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 IgE antibodies to a mixture of 24 common food allergens in a blood sample. It is often called a food allergen screening panel; the exact foods included may vary by laboratory.

Why might I need this test?

It may be used to investigate reactions after eating, such as hives, swelling, wheezing, vomiting, or other symptoms suspected to be related to food. Your clinician will interpret the panel alongside your history and other allergy testing.

How is the test performed?

A blood sample is collected and tested for IgE antibodies against the foods in the panel. RAST is an older term for this type of blood-based allergen antibody testing.

How do I prepare for the test?

Fasting is generally not required. Antihistamines and some other medicines can affect results, so tell your clinician about all medicines and supplements before testing; do not stop prescribed treatment 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 (24 foods)

Frequently asked questions

Does a positive result mean I have a food allergy?
Not necessarily. A positive result shows sensitization to a food, and clinical symptoms are needed to determine whether it represents a true allergy.
Can I stop eating a food because of this test?
Discuss any food restrictions with your clinician before making significant changes. Avoiding foods unnecessarily can affect nutrition and quality of life.
Why does the panel include 24 different foods?
The panel screens broadly for common food triggers when the suspected food is not clear. The specific allergens tested may differ among laboratories, so request the test's food list if needed.
  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