Peanut IgG4
Use
The test is used in special clinical situations to select foods for evaluation by diet elimination and challenge in patients who have food-related complaints. It can also be used to evaluate food allergic patients prior to food challenges. The presence of food-specific IgG4 has been studied in response to various oral food immunotherapy treatments, indicating it might be helpful in understanding allergic responses, although reference ranges and utility have not been clearly established.
Special Instructions
Not provided.
Limitations
The clinical utility of food-specific IgG4 tests has not been clearly established, and reference ranges for these tests have not been developed. The test may not reliably indicate the presence or severity of food allergies or intolerances. Furthermore, the relation of IgG4 levels to actual clinical symptoms remains unclear. Hemolysis, lipemia, and icterus conditions are listed, but no specific rejection criteria regarding them are provided other than being acceptable (NA stated).
Methodology
Immunoassay (FEIA)
Biomarkers
LOINC Codes
- 56351-0 - Peanut IgG4-mCnc
- 56351-0 - Peanut IgG4-mCnc
Result Turnaround Time
2-7 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.
Storage Instructions
Refrigerate serum after processing.
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 7 days |
| Refrigerated | 28 days |
| Frozen | 365 days |