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HelpTest ID BLWX Walnut-Food Components, IgE, Serum
Specimen Required
Only orderable as a reflex. For more information see BLWRF / Walnut-Food, IgE, with Reflex to Walnut-Food Components, IgE, Serum.
Collection Container/Tube:
Preferred: Serum gel
Acceptable: Red top
Submission Container/Tube: Plastic vial
Specimen Volume: 1 mL
Collection Instructions: Centrifuge and aliquot serum into a plastic vial.
Useful For
Evaluation of patients with suspected walnut-food allergy to one of 2 walnut-food components
Testing Algorithm
If total walnut-food IgE result is 0.10 kU/L or more, then walnut-food component (Jug r 1 and Jug r 3) testing is performed at an additional charge.
Method Name
Only orderable as a reflex. For more information see BLWRF / Walnut-Food, IgE, with Reflex to Walnut-Food Components, IgE, Serum.
Fluorescent Enzyme Immunoassay (FEIA)
Reporting Name
Walnut-Food Components, IgE, SSpecimen Type
SerumSpecimen Minimum Volume
0.6mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum | Refrigerated (preferred) | 14 days | |
| Frozen | 90 days |
Reference Values
Only orderable as a reflex. For more information see BLWRF / Walnut-Food, IgE, with Reflex to Walnut-Food Components, IgE, Serum.
|
Class |
IgE kU/L |
Interpretation |
|
0 |
<0.10 |
Negative |
|
0/1 |
0.10-0.34 |
Borderline/Equivocal |
|
1 |
0.35-0.69 |
Equivocal |
|
2 |
0.70-3.49 |
Positive |
|
3 |
3.50-17.4 |
Positive |
|
4 |
17.5-49.9 |
Strongly positive |
|
5 |
50.0-99.9 |
Strongly positive |
|
6 |
≥100 |
Strongly positive |
Concentrations of 0.70 kU/L or more (class 2 and above) will flag as abnormally high.
Reference values apply to all ages.
Day(s) Performed
Monday through Friday
Report Available
Same day/1 to 3 daysPerforming Laboratory
Mayo Clinic Laboratories in Rochester
Test Classification
This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.CPT Code Information
86008 x2
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| BLWX | Walnut-Food Components, IgE, S | 63486-5 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| INBLW | Walnut-Food IgE Ab Interpretation | 69048-7 |
| R1JUG | Jug r 1 (Walnut-Food), IgE, S | 81790-8 |
| R3JUG | Jug r 3 (Walnut Extract), IgE, S | 81789-0 |