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Food Allergen Mix 77 IgE — Radioallergosorbent Test (RAST)

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

A blood test that measures IgE antibodies to a panel of food allergens, helping evaluate possible food-related allergic reactions.

Quick summary

["Detected IgE may indicate food-allergy sensitization, but symptoms and other testing are needed to confirm clinical allergy."]

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

Key facts at a glance

LOINC
82564-6
Short code
Food Allerg Mix77 IgE RAST
Synonyms
Food Allerg Mix77 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 blood test measures IgE antibodies directed against a group of food allergens. The exact foods included depend on the laboratory's Mix 77 panel.

Why might I need this test?

It may be used to investigate suspected food allergy, especially after a reaction involving a food. Results can help identify which foods may warrant further evaluation or avoidance guidance.

How is the test performed?

A blood sample is analyzed for allergen-specific IgE using a laboratory immunoassay, also known by the older term radioallergosorbent test or RAST.

How do I prepare for the test?

Fasting is usually not required. Tell your clinician about any medicines you take and do not stop medications without medical advice. Continue your usual diet unless your clinician instructs otherwise.

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 (Mix 77)

Frequently asked questions

Does a positive result mean I have a food allergy?
Not necessarily. It indicates that IgE antibodies to an included food allergen were detected, but some people have sensitization without symptoms when they eat the food.
Which foods are included in Mix 77?
The foods in this predefined panel may vary by laboratory or test version. Check with the ordering clinician or testing laboratory for the exact allergen list.
Can this test diagnose a food allergy?
It can support evaluation but is not usually diagnostic by itself. Your clinician will interpret it alongside your reaction history, examination, and other tests.
  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