Silver Birch rBet v 2.4 IgE Antibody, Qualitative (RAST)
A qualitative test for IgE antibodies to the recombinant silver birch pollen allergen Bet v 2.4. A positive result suggests sensitization to this allergen.
["A positive result indicates that your immune system has made IgE antibodies to the silver birch allergen Bet v 2.4."]
Key facts at a glance
- LOINC
- 51576-7
- Short code
- Deprecated Silver Birch (rBet v) 2+4 IgE RAST Ql
- Synonyms
- Deprecated Silver Birch (rBet v) 2+4 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 test measures IgE antibodies directed against rBet v 2.4, a recombinant component of silver birch pollen. It is reported as positive or negative to help identify sensitization to this specific birch allergen.
Why might I need this test?
Your clinician may order this test when you have symptoms of a pollen allergy, such as sneezing, runny nose, or itchy eyes, especially during the birch pollen season. It may also help identify which birch allergen triggers your symptoms.
How is the test performed?
A blood sample is tested in the laboratory for IgE antibodies that bind the rBet v 2.4 allergen. The result is reported qualitatively as positive or negative.
How do I prepare for the test?
No special preparation is usually required. Tell your clinician about any medicines you take, recent allergic reactions, and whether you have recently received biologic allergy treatment, which can affect test results.
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 means IgE antibodies to rBet v 2.4 are present, indicating sensitization to this silver birch pollen component. This may help explain pollen-related allergy symptoms, but the result should be interpreted with your symptoms, exposure history, and other allergy tests.
Short name
Silver Birch Bet v 2.4 IgE
Frequently asked questions
Does a positive result mean I will have an allergic reaction?
Is this test the same as a general silver birch allergy test?
Can medicines affect the 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