Skip to content

White Birch Allergen-Specific IgE (RAST), Qualitative — Deprecated

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

A qualitative blood test for IgE antibodies to white birch, used to assess allergic sensitization. This assay may be labeled deprecated in some laboratory systems.

Quick summary

["A positive result suggests an immune sensitization to white birch but does not by itself confirm a clinical allergy."]

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

Key facts at a glance

LOINC
43841-6
Short code
Deprecated White Birch IgE RAST Ql
Synonyms
Deprecated White Birch 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 detects IgE antibodies directed against white birch, a tree pollen allergen. It is a qualitative radioallergosorbent test (RAST), meaning the result is reported as positive or negative rather than with a measured concentration.

Why might I need this test?

It may be used to evaluate suspected white birch allergy, particularly when symptoms occur during the birch pollen season or after exposure to birch trees. Results are considered together with your symptoms, exposure history, and other allergy testing.

How is the test performed?

A blood sample is analyzed for antibodies that bind to white birch allergen. The laboratory determines whether allergen-specific IgE is detected and reports the result qualitatively.

How do I prepare for the test?

No special preparation is usually required for a blood test. Tell your clinician about your allergy symptoms, recent exposures, and any medications or treatments that could affect interpretation; do not stop prescribed medicines without medical advice.

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

White birch IgE (RAST), qualitative

Frequently asked questions

Does a positive result mean I am allergic to white birch?
It indicates sensitization to white birch, but it does not by itself confirm a clinical allergy. Your clinician should interpret it alongside symptoms, exposure history, and other test findings.
Why is this test marked as deprecated?
The label means this assay may no longer be routinely offered or may have been replaced in some laboratory catalogs. A clinician can determine whether another white birch allergen test is more appropriate.
What symptoms can be related to white birch allergy?
Possible symptoms include sneezing, runny or congested nose, itchy or watery eyes, coughing, wheezing, and throat irritation, especially during the birch pollen season.
  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