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HelpTest Code FWHG4 Wheat IgG4
Specimen Required
Specimen Type: Serum
Container/Tube: Red Top
Specimen Volume: 0.5 mL
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.
Method Name
Enzyme immunoassay (FEIA)
Reporting Name
Wheat IgG4Specimen Type
SerumSpecimen Minimum Volume
0.5 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum | Refrigerated (preferred) | 28 days | |
| Frozen | 365 days | ||
| Ambient | 7 days |
Reject Due To
| Thawing: | Warm OK; Cold OK |
Reference Values
Reference ranges have not been established for food-specific IgG4 tests.
Day(s) Performed
Monday, Wednesday, Friday
Performing Laboratory
Eurofins ViracorTest Classification
This test was developed and its performance characteristics determined by Eurofins Viracor. It has not been cleared or approved by the U.S. Food and Drug Administration.CPT Code Information
86001
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| FWHG4 | Wheat IgG4 | 56417-9 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| FWHG4 | Wheat IgG4 | 56417-9 |
Interpretation
The clinical utility of food-specific IgG4 tests has not been clearly established. These tests can be used in special clinical situations to select foods for evaluation by diet elimination and challenge in patients who have food-related complaints, and 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 but cutoffs have not been established.