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Cinnamon IgG Radioallergosorbent Test (RAST), Qualitative — Deprecated

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

A historical blood test for detecting IgG antibodies to cinnamon. It is not a reliable stand-alone test for diagnosing cinnamon allergy.

Quick summary

["This deprecated test may detect a cinnamon-specific IgG response, but a result does not by itself confirm allergy."]

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

Key facts at a glance

LOINC
21202-7
Short code
Deprecated Cinnamon IgG RAST Ql
Synonyms
Deprecated Cinnamon IgG RAST Ql
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
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 was a qualitative blood test designed to detect IgG antibodies directed against cinnamon. The term RAST refers to a radioallergosorbent testing method, and this test is now considered deprecated.

Why might I need this test?

It may have been used to investigate a suspected food-related immune response to cinnamon. Food-specific IgG testing is generally not recommended for diagnosing allergy because IgG can occur without symptoms and is not the antibody type that usually drives immediate food allergy.

How is the test performed?

In its historical form, the test measured serum using a RAST-style laboratory method and reported antibodies as present or absent. Because the assay is deprecated, it is not routinely available and may be unavailable for clinical use.

How do I prepare for the test?

No special preparation can be given for a test that is no longer routinely offered. If an alternative test is recommended, follow your clinician's instructions and tell the laboratory about any food reactions, medication use, and recent symptoms.

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

Cinnamon IgG RAST (deprecated)

Frequently asked questions

Does a positive cinnamon IgG RAST mean I am allergic to cinnamon?
No. Cinnamon-specific IgG can occur in people without allergy, so this result alone does not confirm that cinnamon causes symptoms.
Is the cinnamon IgG RAST test still available?
The test is considered deprecated and is not routinely offered. A clinician can recommend current allergy evaluation or testing when appropriate.
What should I do if I have symptoms after eating cinnamon?
Discuss the reaction with your clinician or an allergist, especially if it includes hives, swelling, wheezing, vomiting, or other concerning symptoms. Keep a record of the foods, symptoms, and timing of the reaction.
  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