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Silver Birch-Specific IgG Antibody, Radioallergosorbent Test — Qualitative (Deprecated)

Published: August 9, 2026Updated: August 17, 2026

A qualitative test for IgG antibodies to silver birch, indicating possible exposure or sensitization. This test is deprecated.

Quick summary

["This older test can detect silver birch-specific IgG antibodies, but it does not by itself diagnose a silver birch allergy."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
25350-0
Short code
Deprecated Silver Birch IgG RAST Ql
Synonyms
Deprecated Silver Birch 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 test looks for IgG antibodies directed against silver birch, a tree pollen allergen. It is reported as positive or negative and is marked as deprecated.

Why might I need this test?

It may have been used to assess previous exposure to silver birch or sensitization to its pollen. It is not usually used to confirm a clinical allergy, because a positive result does not necessarily cause symptoms.

How is the test performed?

A blood sample is analyzed using a radioallergosorbent method or a related laboratory method to detect silver birch-specific IgG antibodies. The result is reported qualitatively as positive or negative.

How do I prepare for the test?

No special preparation is usually required. Follow any instructions provided by the laboratory, particularly if you have recently taken medicines that could affect the result.

Reference range

Adult: 10-40 U/LN/A

Specimen: serum

No special preparation required. Avoid fatty meals before the test if possible.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Silver Birch-Specific IgG Test

Frequently asked questions

Does a positive result mean I am allergic to silver birch?
No. This test detects IgG antibodies, which may occur after exposure without causing allergy symptoms. Your clinician should interpret the result alongside your symptoms and other allergy testing.
Why is this test described as deprecated?
The test is an older method and is no longer routinely used for allergy evaluation. Current testing more often uses a clinical assessment and specific IgE testing when appropriate.
What symptoms can occur with silver birch allergy?
Possible symptoms include sneezing, runny nose, watery eyes, coughing, wheezing, or throat irritation, especially during the tree-pollen season. Not everyone exposed to silver birch develops these symptoms.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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