Meadow Foxtail, IgE, Serum
Use
The test is useful for establishing a diagnosis of an allergy to meadow foxtail by identifying the specific allergens responsible for eliciting signs and symptoms. It can help confirm sensitization prior to immunotherapy and investigate the specificity of allergic reactions to various allergens like insect venom, drugs, or chemicals. It is not useful for determining residual clinical sensitivity post-immunotherapy or in cases where allergen identification does not affect management decisions.
Special Instructions
Testing for IgE antibodies is not useful in patients who have undergone immunotherapy and those whose clinical management does not require allergen identification. For orders not placed electronically, an Allergen Test Request form (T236) must be completed and submitted with the specimen.
Limitations
Some patients with clinically insignificant allergen sensitivity may still show measurable IgE levels, which should be considered in the clinical interpretation. False positives may occur in cases of markedly elevated serum IgE (>2500 kU/L) due to nonspecific binding during the test process.
FDA ApprovedNew York Approved
Methodology
Immunoassay (Fluorescence Enzyme Immunoassay (FEIA))
Biomarkers
LOINC Codes
- 6170-5
- 6170-5
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
For 1 allergen: 0.3 mL; For more than 1 allergen: (0.05 mL x number of allergens) + 0.25 mL deadspace
Container
Preferred: Serum gel; Acceptable: Red top; Submission: Plastic vial
Collection Instructions
Centrifuge and aliquot serum into a plastic vial.
Causes for Rejection
Gross lipemia is OK
Stability Requirements
| Temperature | Period |
|---|---|
| Refrigerated | 14 days |
| Frozen | 90 days |