Walnut Food (Juglans spp) IgG
Use
The Walnut Food (Juglans spp) IgG test is intended for detecting serum IgG antibodies to walnut proteins, which may indicate immunological sensitization to the allergen. While the presence of food-specific IgG suggests exposure or sensitization, it should not be taken as evidence of a food allergy. It is commonly used in special clinical situations to guide food elimination and dietary challenges in patients with food-related complaints. However, the clinical utility of food-specific IgG tests has not been firmly established.
Special Instructions
This test should be ordered by physicians who are aware of its limitations, including the fact that it does not confirm a food allergy. Proper interpretation is crucial to avoid misdiagnosis and inappropriate dietary restrictions.
Limitations
Reference ranges for food-specific IgG tests are not established, and the presence of IgG alone cannot confirm a food allergy. It only indicates immunologic sensitization and should not be used in isolation to guide clinical decisions. Interpretive caution is necessary to ensure appropriate clinical use. Misinterpretation can lead to unnecessary dietary restrictions.
Methodology
Immunoassay (ELISA)
Biomarkers
LOINC Codes
- 63120-0
- 63120-0
Result Turnaround Time
3-7 days
Related Documents
For more information, please review the documents below
Specimen
Serum
Volume
0.5 mL
Minimum Volume
0.5 mL
Container
Plastic vial
Collection Instructions
Draw blood in a plain red-top tube(s), serum gel tube(s) is acceptable. Spin down and send 0.5 mL of serum refrigerated in a plastic vial.
Causes for Rejection
Hemolysis, Lipemia, Icterus, Other
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 7 days |
| Refrigerated | 28 days |
| Frozen | 365 days |