Skip to content

Brussels Sprouts-Specific IgG, Radioallergosorbent Test (RAST), Qualitative (Deprecated)

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

A deprecated qualitative RAST test for IgG antibodies to Brussels sprouts. A positive result shows an immune response, not necessarily a food allergy.

Quick summary

["This test detects Brussels sprouts-specific IgG, 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
21126-8
Short code
Deprecated Brussel Sprouts IgG RAST Ql
Synonyms
Deprecated Brussel Sprouts 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 blood test that looks for IgG antibodies directed against Brussels sprouts using radioallergosorbent test (RAST) methodology. The named test is deprecated and may no longer be available from laboratories.

Why might I need this test?

It may have been used to evaluate an immune response after eating Brussels sprouts, particularly when a person reported gastrointestinal or other symptoms. It may also have been included in broader food-antibody panels.

How is the test performed?

A blood sample is tested against Brussels sprout antigen using RAST methodology. Because this is a qualitative test, the result is generally reported as detected or not detected rather than as a measured concentration.

How do I prepare for the test?

No special preparation is usually specified for this test. Because the named test is deprecated, check with the ordering clinician or laboratory to confirm that an alternative test is available and to follow its preparation instructions.

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

Brussels Sprouts IgG (RAST)

Frequently asked questions

Does a positive result mean I am allergic to Brussels sprouts?
No. Detectable Brussels sprouts-specific IgG does not prove allergy or predict a serious reaction. Your clinician should interpret the result in the context of your symptoms and exposure history.
What if the result is negative?
A negative result means IgG to Brussels sprouts was not detected by this test. It does not completely exclude sensitivity, and other causes of symptoms may need to be evaluated.
Why is this test marked as deprecated?
The named test has been retired or replaced and may not be available. Ask the ordering clinician about a currently available alternative and whether testing is appropriate.
  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