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Garlic-Specific IgG Antibody, Qualitative (RAST) — Deprecated

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

A qualitative blood test that looks for antibodies directed against garlic. This test entry is marked deprecated, and the exact assay should be confirmed with the laboratory.

Quick summary

["A positive result shows an immune response to garlic but does not by itself confirm a garlic allergy."]

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

Key facts at a glance

LOINC
21285-2
Short code
Deprecated Garlic IgG RAST Ql
Synonyms
Deprecated Garlic 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 qualitative test looks for garlic-specific IgG antibodies in a blood sample. The RAST label refers to a radioallergosorbent testing method, although this test entry is marked deprecated and should be confirmed with the laboratory.

Why might I need this test?

It may have been used to evaluate an immune response to garlic or to help investigate a suspected food-related reaction. Food-specific IgG results generally indicate exposure or immune recognition and are not, on their own, a diagnosis of allergy.

How is the test performed?

A laboratory analyzes the blood sample using an immunoassay-style procedure designed to detect garlic-reactive antibodies. The result is generally reported as positive or negative rather than as a measured concentration.

How do I prepare for the test?

No special preparation is usually required for a routine antibody blood test. Follow the laboratory's instructions, and tell your clinician about food allergies, recent symptoms, and any immunosuppressive medicines you are taking.

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

Garlic-Specific IgG (Qualitative)

Frequently asked questions

Does a positive garlic IgG result mean I am allergic to garlic?
No. Garlic-specific IgG can occur after exposure and is not a reliable stand-alone marker of allergy. Symptoms and, when appropriate, testing for garlic-specific IgE or supervised oral food challenge are more useful for evaluating a true food allergy.
What does a negative result mean?
It means that garlic-specific IgG was not detected by this test. It does not completely exclude garlic intolerance or an allergy caused by a mechanism other than IgG.
Why is this test listed as deprecated?
The test entry is no longer considered current or preferred. Ask the laboratory whether it uses a newer food-specific antibody test or another method appropriate for the clinical question.
  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