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Broccoli IgG Antibody, Qualitative (Radioallergosorbent Test) — Deprecated

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

A qualitative blood test for IgG antibodies directed against broccoli proteins. This test is deprecated and is not considered a reliable stand-alone test for food allergy.

Quick summary

["A positive result shows broccoli-specific IgG antibodies but does not by itself diagnose a broccoli allergy."]

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

Key facts at a glance

LOINC
21124-3
Short code
Deprecated Broccoli IgG RAST Ql
Synonyms
Deprecated Broccoli 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 qualitative test that detects IgG antibodies associated with exposure to broccoli. It has been marked as deprecated because food-specific IgG results do not reliably distinguish allergy from tolerance or previous exposure.

Why might I need this test?

It may have been used to evaluate a suspected food-related reaction to broccoli or to guide an elimination diet. A history of symptoms, including timing and reproducibility, is more informative than this antibody result alone.

How is the test performed?

A blood sample is tested for antibodies that bind to broccoli proteins using a radioallergosorbent-type laboratory method. The result is reported as positive or negative.

How do I prepare for the test?

No special preparation is usually required. Because this test is deprecated, confirm with the ordering clinician or laboratory that it is still available and whether an alternative test is preferred.

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

Broccoli IgG antibody test

Frequently asked questions

Does a positive broccoli IgG result mean I am allergic to broccoli?
No. Broccoli-specific IgG can occur in people who tolerate broccoli, so a positive result alone does not diagnose allergy.
Why is this test considered deprecated?
Food-specific IgG testing has limited clinical value for diagnosing immediate food allergy. Better evaluation usually relies on the reaction history and appropriately selected skin-prick or blood IgE testing.
What should I do if I have symptoms after eating broccoli?
Discuss the timing, symptoms, and foods eaten with your clinician. Seek urgent care for trouble breathing, throat swelling, faintness, or other signs of a severe allergic 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