Wheat IgG Antibody, Serum/Plasma — Qualitative (Deprecated)
A qualitative blood test that detects IgG antibodies to wheat. This legacy test may be used to evaluate suspected wheat sensitization, but results should not be interpreted alone.
["A positive result suggests an immune response to wheat but does not by itself confirm a wheat allergy."]
Key facts at a glance
- LOINC
- 21602-8
- Short code
- Deprecated Wheat IgG RAST Ql
- Synonyms
- Deprecated Wheat 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 wheat-specific IgG antibodies in blood. It is marked as deprecated, meaning newer, more specific allergy testing approaches may be preferred.
Why might I need this test?
It may have been used to help evaluate a suspected immune reaction to wheat, particularly when a person has digestive symptoms, skin symptoms, or other symptoms after eating wheat. The result must be considered with the medical history and other allergy tests.
How is the test performed?
A blood sample is collected and tested for the presence of wheat-specific IgG antibodies. The result is generally reported as detectable or not detectable.
How do I prepare for the test?
No special preparation is usually required for a routine blood draw. Tell your clinician about wheat reactions, other allergies, medications, and any recent changes in your diet.
Reference range
Adult: 10-40 U/LN/A
No special preparation required. Avoid fatty meals before the test if possible.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Detectable wheat-specific IgG may indicate sensitization or an immune response to wheat, but it does not prove that symptoms are caused by wheat or that a clinical allergy is present. IgG testing can also be positive in people without symptoms, so results should not be used as the sole basis for a wheat allergy diagnosis.
Short name
Wheat IgG antibody test
Frequently asked questions
Does a positive result mean I have a wheat allergy?
Why is this test marked as deprecated?
Should I stop eating wheat because of a positive result?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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