Test Directory
| Test Code | ||||
| WALN4 | ||||
| Test Name | ||||
| Walnut IgG4 | ||||
| CPT Codes | ||||
| 86001 | ||||
| Expected Turnaround Time | ||||
| 2 - 3 days | ||||
| Clinical Utility | ||||
|
The clinical utility of food-specific IgG4 tests has not been clearly established. Physicians sometimes use allergen-specific IgG4 to evaluate patients prior to or during immunotherapy. These tests can be used in special clinical situations. This test should only be ordered by physicians who recognize the limitations of the test. |
||||
| Specimen and Container Info | ||||
|
Specimen Type: Serum
Preferred Collection Container: Red Top, Plain Alternate Collection Container: Gold Top, Serum Separator Desired Specimen Volume: 0.5 mL |
||||
| Collection Instructions | ||||
|
||||
| Processing and Submission Instructions | ||||
|
||||
| Transport Instructions | ||||
|
Transport to the laboratory refrigerated. |
||||
| Stability Requirements | ||||
|
||||
| Methodology | ||||
| Enzyme Immunoassay | ||||
| Reference Intervals | ||||
|
See patient report. |
||||
| Alternate Names | ||||
|
||||
| Reference Lab | ||||
| Viracor Eurofins | ||||
| Testing Schedule | ||||
| Varies | ||||
The American Medical Association (AMA) Current Procedural Terminology (CPT) codes published by HNL Lab Medicine are guidelines and are intended for informational purposes only. CPT coding is the exclusive responsibility of the billing entity. View the Terms.
© 2026 HNL Lab Medicine. All rights reserved.