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Food Allergen Mix (FX73) IgE, Serum — Radioallergosorbent Test

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

Measures IgE antibodies to a panel of foods in the FX73 panel to help evaluate possible food allergies.

Quick summary

["Elevated food-specific IgE may support a suspected food allergy, but results 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
82075-3
Short code
Food Allergen Mix fx73 IgE RAST
Synonyms
Food Allergen Mix fx73 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 allergen-specific IgE antibodies against several foods included in the FX73 allergen panel. IgE is an immune-system protein that can react with food allergens.

Why might I need this test?

This test may be used to help evaluate suspected food allergies, especially when symptoms occur after eating particular foods. It may also be useful for monitoring an established food allergy.

How is the test performed?

A blood sample is drawn and tested in the laboratory for IgE antibodies to the foods in the panel. The laboratory may use a radioallergosorbent method or another validated immunoassay.

How do I prepare for the test?

No special preparation is usually required. Tell your clinician about food allergies, recent symptoms, current medicines, and any changes in your diet before the test.

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.

Detectable food-specific IgE indicates sensitization to one or more foods in the panel, but it does not by itself confirm a clinical allergy. The significance depends on the specific food, the antibody level, your symptoms, and the results of other allergy tests.

Short name

Food Allergen Mix IgE

Frequently asked questions

Does a positive result mean I have a food allergy?
Not necessarily. A positive IgE result shows possible sensitization, while a food allergy is diagnosed using your symptoms, medical history, and sometimes skin-prick testing or supervised food challenges.
Which foods are included in the FX73 panel?
The foods included can vary by laboratory or testing product. Ask the laboratory for the specific allergen list, since the panel may not test every possible food allergy.
Should I stop eating a suspected allergen before testing?
Do not deliberately avoid a food unless your clinician advises you to do so. Eating an allergen that you tolerate may affect testing, so discuss your diet and recent reactions with your clinician first.
  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