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Food Allergen Mix 9 IgE, Serum — Radioallergosorbent Test (RAST)

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

A blood test that measures IgE antibodies to a group of foods in the Food Allergen Mix 9 panel. It can help identify possible food sensitization when combined with your symptoms and medical history.

Quick summary

["Detectable food-specific IgE may indicate an immune sensitivity, but it does not by itself prove a symptomatic food allergy."]

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

Key facts at a glance

LOINC
82079-5
Short code
Food Allerg Mix9 IgE RAST
Synonyms
Food Allerg Mix9 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 foods included in a panel known as Food Allergen Mix 9. The exact foods represented can vary by laboratory, so check the test order or laboratory report for the panel components. RAST is an older name commonly used for food-specific IgE blood testing.

Why might I need this test?

You may need this test if you have symptoms such as hives, swelling, abdominal pain, vomiting, wheezing, or difficulty breathing after eating certain foods. Your clinician may also use it to evaluate suspected food sensitivity before deciding whether further allergy testing is appropriate.

How is the test performed?

A blood sample is drawn and tested for IgE antibodies against the foods in the panel. The laboratory may report each food separately or provide a panel summary, depending on the test used.

How do I prepare for the test?

No fasting is usually required. Do not stop foods or medications on your own before testing; ask your clinician whether any medicines or planned food challenges could affect interpretation.

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 9 IgE (RAST)

Frequently asked questions

Does a positive result mean I am allergic to every food in the panel?
No. If results are reported for individual foods, each result is interpreted separately. A positive result suggests sensitization but must be considered alongside symptoms and exposure history.
How severe might a food reaction be?
The IgE level alone cannot determine reaction severity. Your clinician should assess your symptoms, other test findings, and history of reactions to guide counseling and treatment.
Should I avoid all foods included in the panel if the test is positive?
Do not begin a broad elimination diet without medical guidance. Unnecessary food restriction can cause nutritional problems, and your clinician can help identify which specific foods, if any, should be avoided.
  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