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Endive-Specific IgG Antibody, Qualitative — Radioallergosorbent Test (Deprecated)

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

A legacy qualitative blood test for IgG antibodies to endive using a radioallergosorbent method; it has been deprecated and is not a standard allergy test.

Quick summary

["This deprecated test may detect an immune response to endive, but a positive result does not by itself diagnose food allergy."]

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

Key facts at a glance

LOINC
21258-9
Short code
Deprecated Endive IgG RAST Ql
Synonyms
Deprecated Endive 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 is a legacy test that looked for IgG antibodies directed against endive, also known as chicory, using a radioallergosorbent test method. “Deprecated” means the test is no longer routinely available or recommended for current clinical use.

Why might I need this test?

You may see this test in older medical records, or a clinician may review a historical result as part of an allergy evaluation. It is generally not ordered today because food-specific IgG testing has limited value for diagnosing true food allergy.

How is the test performed?

The original test used serum obtained from a blood sample and reported a qualitative result, such as detected or not detected. The laboratory method and reporting terminology may differ from current allergy testing.

How do I prepare for the test?

No special preparation is generally required for the blood draw. Because this test is deprecated, contact the laboratory or ordering clinician before repeating it and do not change your diet or medications solely because of an old result.

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

Endive IgG RAST (deprecated)

Frequently asked questions

Is this endive allergy test still commonly used?
No. It is deprecated and is not considered a standard test for diagnosing endive allergy. Current evaluation is based primarily on the clinical history and, when appropriate, skin-prick or other validated allergy testing.
Does a positive result mean I am allergic to endive?
Not necessarily. It may indicate prior exposure or an immune response, but food-specific IgG antibodies can also occur in people without symptoms. Your clinician should interpret the result in context.
Should I avoid endive based on this result?
Do not eliminate endive from your diet solely because of this test. Discuss any symptoms or suspected allergy with a healthcare professional before making dietary changes.
  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