Walnut Tree, IgE, Serum
Use
Establishing a diagnosis of an allergy to walnut tree and defining the allergen responsible for eliciting signs and symptoms. Useful for identifying allergens responsible for allergic response and/or anaphylactic episodes. Confirms sensitization prior to starting immunotherapy and investigates the specificity of allergic reactions to insect venom allergens, drugs, or chemical allergens.
Special Instructions
Ordering Guidance: Refer to the Allergens - Immunoglobulin E (IgE) Antibodies list for available testing. Special Instructions: Include the Allergen Test Request form (T236) with the specimen if not ordering electronically.
Limitations
Testing for IgE antibodies is not useful in patients previously treated with immunotherapy to determine residual clinical sensitivity or in patients where medical management does not depend on identification of allergen specificity. False-positive results may occur in patients with markedly elevated serum IgE (>2500 kU/L) due to nonspecific binding to allergen solid phases. Test results must be interpreted in the clinical context as some individuals with clinically insignificant sensitivity to allergens may have measurable IgE antibodies.
FDA ApprovedNew York Approved
Methodology
Immunoassay (FEIA)
Biomarkers
LOINC Codes
- 6274-5
- 6274-5
Result Turnaround Time
1-3 days
Related Documents
For more information, please review the documents below
Specimen
Serum
Volume
0.5 mL for every 5 allergens requested
Minimum Volume
0.3 mL for 1 allergen
Container
Plastic vial
Collection Instructions
Centrifuge and aliquot serum into a plastic vial.
Stability Requirements
| Temperature | Period |
|---|---|
| Refrigerated | 14 days |
| Frozen | 90 days |