Barley Grass, IgE, Serum
Use
This test is useful for establishing a diagnosis of an allergy to Barley grass and defining the allergen responsible for eliciting signs and symptoms. It helps identify allergens responsible for allergic response and/or anaphylactic episodes, confirm sensitization prior to beginning immunotherapy, and investigate the specificity of allergic reactions to insect venom allergens, drugs, or chemical allergens. Testing for IgE antibodies is not useful in patients previously treated with immunotherapy to determine if residual clinical sensitivity exists or in patients where medical management does not depend on allergen specificity.
Special Instructions
If not ordering electronically, complete and send an Allergen Test Request form (T236) with the specimen. For a listing of allergens available for testing, see Allergens - Immunoglobulin E (IgE) Antibodies PDF.
Limitations
Some individuals with clinically insignificant sensitivity to allergens may have measurable levels of IgE antibodies in serum, requiring clinical context for interpretation. False-positive results for IgE antibodies may occur in patients with markedly elevated serum IgE (>2500 kU/L) due to nonspecific binding to allergen solid phases.
FDA ApprovedNew York Approved
Methodology
Immunoassay (Fluorescence Enzyme Immunoassay (FEIA))
Biomarkers
LOINC Codes
- 6037-6
- 6037-6
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
Container
Plastic vial
Collection Instructions
Centrifuge and aliquot serum into a plastic vial.
Causes for Rejection
Gross hemolysis OK, Gross lipemia OK
Stability Requirements
| Temperature | Period |
|---|---|
| Refrigerated | 14 days |
| Frozen | 90 days |