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Green Bean–Specific IgG Antibody, Qualitative (RAST) [Deprecated]

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

This is an older, deprecated blood test that looks for antibodies directed against green bean. It is not a standard test for diagnosing food allergy.

Quick summary

["A positive green bean IgG result may indicate immune exposure but does not by itself diagnose a green bean allergy."]

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

Key facts at a glance

LOINC
21098-9
Short code
Deprecated Green Bean IgG RAST Ql
Synonyms
Deprecated Green Bean 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 test looks for green bean–specific IgG antibodies in a blood sample using a RAST-type laboratory method. It is marked as deprecated, meaning it is an older test that is no longer commonly used.

Why might I need this test?

It may have been ordered to evaluate an immune response to green bean. Food-specific IgG tests are sometimes used to assess possible food sensitivity, but they are not generally recommended for diagnosing food allergy.

How is the test performed?

A blood sample is tested for antibodies that react with green bean proteins, and the result is reported as detectable or not detectable. Because this assay is deprecated, the laboratory should confirm the exact test that was performed.

How do I prepare for the test?

No special preparation is usually required for a blood antibody test. Follow any instructions provided by the ordering clinician or laboratory, particularly if you have a history of severe allergic reactions.

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

Green bean IgG antibody test

Frequently asked questions

Does a positive result mean I am allergic to green bean?
No. Green bean-specific IgG can be present in people without an allergy, so this result alone cannot diagnose food allergy.
Is this the same as a green bean IgE allergy test?
No. IgG and IgE are different antibody classes. RAST is most commonly associated with IgE testing, so the original laboratory report should be checked to confirm what was measured.
What should I do if I have symptoms after eating green bean?
Discuss the result and your symptoms with your clinician. If you have trouble breathing, throat swelling, faintness, or other severe symptoms, seek emergency care rather than relying on this test.
  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