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HelpTest Code FEWG4 Egg White IgG4
Specimen Required
Collection Container/Tube:
Preferred: Red Top
Acceptable: Serum gel
Specimen Volume: 0.5 mL
Collection Instructions:
1. Draw blood in a plain red-top tube(s), serum gel tube(s) is acceptable.
2. Centrifuge and aliquot 0.5 mL of serum in a plastic vial.
3. Send refrigerate.
Method Name
Enzyme Immunoassay (FEIA)
Reporting Name
Egg White IgG4Specimen Type
SerumSpecimen Minimum Volume
See Specimen Required
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum | Refrigerated (preferred) | 28 days | |
| Frozen | 365 days | ||
| Ambient | 7 days |
Reject Due To
| Thawing: | Cold OK; Warm 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 |
|---|---|---|
| FEWG4 | Egg White IgG4 | 56253-8 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| FEWG4 | Egg White IgG4 | 56253-8 |
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 alone has been studied in response to various oral food immunotherapy treatments but cutoffs have not been established.