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Food Allergen IgE Panel (32-Allergen Mix), Radioallergosorbent Test (RAST)

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

A blood test that measures IgE antibodies to 32 common food allergens to help identify possible food sensitization.

Quick summary

["Results can identify foods that may trigger an IgE-mediated allergy, but they must be interpreted alongside symptoms and other allergy testing."]

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

Key facts at a glance

LOINC
82551-3
Short code
Food Allerg Mix32 IgE RAST
Synonyms
Food Allerg Mix32 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 panel is a radioallergosorbent test (RAST) that measures food-specific IgE antibodies in a blood sample. It screens for sensitization to a mix of 32 common food allergens.

Why might I need this test?

Your clinician may order this test if you have symptoms such as hives, swelling, wheezing, vomiting, or digestive discomfort after eating. It can help narrow the list of possible food triggers.

How is the test performed?

A blood sample is collected and tested for IgE antibodies against each food in the panel. The laboratory reports which allergens show measurable sensitization and may provide a qualitative or graded result.

How do I prepare for the test?

Fasting is usually not required. Antihistamines and some other allergy treatments may affect results, so tell your clinician about all medications and supplements before testing; do not stop prescribed medicines without medical 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

Frequently asked questions

Does a positive result mean I have a food allergy?
Not necessarily. It shows sensitization to the food, and some people have positive results without symptoms when they eat that food. Your clinician can help determine whether the result is clinically meaningful.
Can this test show which food caused my reaction?
It can identify likely food allergens by measuring specific IgE antibodies, but it cannot confirm the cause of a past reaction by itself. Your reaction history is an important part of the diagnosis.
Should I avoid foods based on these results?
Do not start a major elimination diet without guidance from an allergist or other qualified clinician. Unnecessary food restriction can cause nutritional problems, especially in children.
  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