Rice-Specific IgG4 Antibody, Qualitative — Radioallergosorbent Test (RAST) (Deprecated)
A qualitative blood test for rice-specific IgG4 antibodies using a RAST method. This test entry is deprecated and is not commonly used to diagnose rice allergy.
["This deprecated test can indicate an immune response to rice, but it cannot by itself confirm or exclude a rice allergy."]
Key facts at a glance
- LOINC
- 26429-1
- Short code
- Deprecated Rice IgG4 RAST Ql
- Synonyms
- Deprecated Rice IgG4 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 IgG4 antibodies directed against rice in a blood sample. It is reported qualitatively, usually as positive or negative, and uses a radioallergosorbent test (RAST) method. The test entry is marked as deprecated.
Why might I need this test?
Rice-specific IgG4 testing may be used to assess whether a person has developed an immune response to rice. It may provide background information when a history of food reactions is unclear, although it is not a stand-alone test for food allergy.
How is the test performed?
A blood sample is collected and tested for antibodies that recognize rice proteins. The laboratory uses a RAST method to determine whether rice-specific IgG4 is detected, and the result is reported as a qualitative finding.
How do I prepare for the test?
Fasting is generally not required for this type of blood test. Tell the healthcare provider and laboratory about your symptoms, possible rice reactions, allergies, and medications, and follow any preparation instructions supplied by the ordering clinician.
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.
A positive result indicates that rice-specific IgG4 antibodies are present, which may reflect previous exposure or a non-allergic immune response. IgG4 antibodies are not usually interpreted as proof of an active rice allergy, so results must be considered with symptoms and other appropriate allergy testing. Because this test is deprecated, confirm with the ordering laboratory whether it is still available or an alternative should be used.
Short name
Rice-specific IgG4 (RAST), qualitative
Frequently asked questions
Does a positive result mean I am allergic to rice?
What does a negative result mean?
Why is this test listed as deprecated?
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