Johnson Grass, IgE, Serum
Use
The test is used for establishing a diagnosis of an allergy to Johnson grass and for defining the specific allergen responsible for eliciting signs and symptoms. It aids in identifying allergens responsible for allergic response or anaphylactic episodes. It can also confirm sensitization prior to starting immunotherapy and investigate the specificity of allergic reactions to insect venom, 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 cases where management does not depend on allergen specificity.
Special Instructions
If ordering electronically is not possible, complete, print, and send an Allergen Test Request form (T236) with the specimen. For a listing of allergens available for testing, refer to the Allergens - Immunoglobulin E (IgE) Antibodies document.
Limitations
The test may produce false-positive results for IgE antibodies in patients with markedly elevated serum IgE (>2500 kU/L) due to nonspecific binding. Some individuals with insignificant sensitivity to allergens may have measurable levels of IgE antibodies, and results must be interpreted in clinical context.
FDA ApprovedNew York Approved
Methodology
Immunoassay (FEIA)
Biomarkers
LOINC Codes
- 6152-3
- 6152-3
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 |