Sunflower Seed-Specific IgG Antibody — Radioallergosorbent Test (RAST), Qualitative (Deprecated)
An older qualitative blood test for IgG antibodies to sunflower seed proteins. This assay has been deprecated and is not routinely used to diagnose food allergy.
["A positive result shows sunflower seed-specific IgG antibodies but does not by itself prove a clinical allergy."]
Key facts at a glance
- LOINC
- 21547-5
- Short code
- Deprecated Sunflower Seed IgG RAST Ql
- Synonyms
- Deprecated Sunflower Seed 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 designed to detect IgG antibodies directed against proteins in sunflower seeds. RAST stands for radioallergosorbent test, an older laboratory method, and the sunflower seed IgG version of this test has been deprecated.
Why might I need this test?
This test may appear in older medical records or have been ordered by a clinician investigating a possible food-related reaction. Because it is deprecated, a clinician should interpret it alongside your symptoms, exposure history, and any more current allergy evaluation.
How is the test performed?
A blood sample is analyzed using a RAST approach, in which antibodies in the sample react with sunflower seed allergen components. The result is generally reported as positive or negative rather than as a specific concentration.
How do I prepare for the test?
Follow any preparation instructions from the ordering clinician. Antibody blood tests generally do not require fasting, and you should not stop prescribed medications unless your clinician tells you to do so. Tell the clinician about your symptoms and prior reactions to sunflower seeds.
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 IgG antibodies to sunflower seed proteins are present, which may reflect exposure or immune sensitization. It does not by itself establish a clinical food allergy because these antibodies can occur in people without symptoms. A negative result does not completely rule out an allergy or reaction, so the result should be interpreted with your medical history and other appropriate testing.
Short name
Sunflower seed IgG (RAST)
Frequently asked questions
Does a positive result mean I am allergic to sunflower seeds?
Is this test still commonly used?
Do I need to avoid sunflower seeds before the test?
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