Silver Birch rBet v 6 IgE — Radioallergosorbent Test (RAST), Qualitative (Deprecated)
A qualitative blood test that detects IgE antibodies to the silver birch allergen rBet v 6. This test entry is marked deprecated.
["A positive result indicates allergic sensitization to silver birch rBet v 6 but must be interpreted with allergy symptoms and medical history."]
Key facts at a glance
- LOINC
- 82573-7
- Short code
- Deprecated Silver Birch (rBet v) 6 IgE RAST Ql
- Synonyms
- Deprecated Silver Birch (rBet v) 6 IgE 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 blood test looks for IgE antibodies directed against rBet v 6, an allergen found in silver birch pollen. It is reported qualitatively, generally as detected or not detected. The test entry is marked deprecated, so the laboratory may use a newer component-specific or multiplex allergy test instead.
Why might I need this test?
Your clinician may order it to help determine whether symptoms such as sneezing, congestion, or itchy eyes are related to an allergy to silver birch. It may also be considered when symptoms suggest allergy to related pollens or foods that cross-react with birch allergens.
How is the test performed?
A blood sample is collected and tested for IgE antibodies that bind the rBet v 6 allergen. Unlike a skin-prick test, this test does not expose you directly to the allergen and does not usually cause an immediate allergic skin reaction.
How do I prepare for the test?
No fasting is usually required. Follow the laboratory's blood-draw instructions, and tell your clinician about major allergic conditions, recent allergen immunotherapy, or medicines that may affect the interpretation of allergy testing.
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 detected result means that IgE antibodies to rBet v 6 are present, indicating sensitization to this birch allergen. It does not by itself prove that silver birch is the cause of your symptoms, and rBet v 6 may cross-react with allergens from other plants or foods. A not-detected result lowers the likelihood of sensitization but does not completely exclude allergy.
Short name
Silver Birch rBet v 6 IgE
Frequently asked questions
What does a positive result mean?
Can I still have a birch allergy if the result is negative?
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