Skip to content

Food Allergen Mix 31 IgE, Serum

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

This blood test measures IgE antibodies to a panel of food allergens to help identify possible food sensitization.

Quick summary

["A positive result suggests an immune reaction to one or more foods in the tested panel, but must be interpreted alongside symptoms and exposure history."]

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

Key facts at a glance

LOINC
82578-6
Short code
Food Allerg Mix31 IgE RAST
Synonyms
Food Allerg Mix31 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?

The Food Allergen Mix 31 IgE test measures allergen-specific IgE antibodies in blood. It screens for sensitization to a group of common food allergens rather than identifying a reaction that has already occurred.

Why might I need this test?

This test may be used when symptoms suggest a food allergy, such as hives, swelling, gastrointestinal upset, wheezing, or other reactions after eating. It may also help guide evaluation by an allergy specialist.

How is the test performed?

A blood sample is collected and analyzed in a laboratory for IgE antibodies against the foods included in the mix 31 panel. Other allergy testing may be needed to determine which specific food is responsible.

How do I prepare for the test?

Routine preparation is usually not required. Some antihistamines and certain other allergy treatments can affect results, so tell your clinician about all medicines and supplements before testing and ask whether any should be paused temporarily.

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 31 IgE

Frequently asked questions

Does a positive result mean I have a food allergy?
Not necessarily. It shows sensitization to one or more tested foods, but a clinician must correlate the result with your symptoms and exposure history to diagnose a food allergy.
Can this test show which food caused my reaction?
The mix test screens for several foods, so it may not identify the exact culprit. Your clinician may recommend testing individual allergens or supervised oral food testing when appropriate.
Should I stop taking allergy medicine before this test?
Only if your clinician instructs you to. Antihistamines and some other treatments may influence results, and stopping prescribed medication should always be discussed with the prescriber.
  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