Silver Birch rBet v 1 IgE — Radioallergosorbent Test (RAST), Qualitative (Deprecated)
A qualitative blood test for IgE antibodies to the silver birch allergen Bet v 1. A positive result suggests allergic sensitization to silver birch.
["A positive result indicates that your immune system has produced IgE antibodies to the silver birch allergen Bet v 1."]
Key facts at a glance
- LOINC
- 51573-4
- Short code
- Deprecated Silver Birch (rBet v) 1 IgE RAST Ql
- Synonyms
- Deprecated Silver Birch (rBet v) 1 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 checks for IgE antibodies directed against Bet v 1, a major allergen found in silver birch pollen. The result is reported as positive or negative rather than as a specific concentration.
Why might I need this test?
This test may be used to help evaluate suspected allergy to silver birch or birch-family pollens. Your healthcare professional will interpret it alongside your symptoms, exposure history, and other allergy tests.
How is the test performed?
A blood sample is collected and analyzed using a RAST-type or other laboratory method that detects allergen-specific IgE. The laboratory reports whether antibodies to Bet v 1 were detected.
How do I prepare for the test?
Fasting is usually not required for this blood test, and you should generally continue medications unless your healthcare professional gives different instructions. Tell your clinician about your allergy symptoms and any recent exposure to birch pollen.
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 that Bet v 1-specific IgE is present and supports immune sensitization to silver birch. It does not by itself confirm that birch is the cause of your symptoms, and results may need to be compared with your exposure and clinical history. A negative result makes sensitization to this particular allergen less likely but does not completely exclude allergy.
Short name
Silver Birch Bet v 1-Specific IgE
Frequently asked questions
What does a positive result mean?
Does a positive result mean I am allergic to birch?
Why is this test marked 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