Test Code WEED4 Weed Panel # 4, Serum
Ordering Guidance
This test uses a pooled allergen reagent; therefore, the multi-allergen Immunocap (panel cap) is reported with a single qualitative class result and concentration. This is the appropriate first-tier test for allergic disease.
For a listing of allergens available for testing, see Allergens - Immunoglobulin E (IgE) Antibodies in Special Instructions
Specimen Required
Container/Tube:
Preferred: Red top
Acceptable: Serum gel
Specimen Volume: 0.5 mL
Forms
If not ordering electronically, complete, print, and send an Allergen Test Request (T236) with the specimen.
Useful For
Establishing a diagnosis of an allergy to giant ragweed, short ragweed, and Western ragweed
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Defining the allergen responsible for eliciting signs and symptoms
Identifying allergens:
-Responsible for allergic disease and/or anaphylactic episode
-To confirm sensitization prior to beginning immunotherapy
Testing for IgE antibodies is not useful in patients previously treated with immunotherapy to determine if residual clinical sensitivity exists, or in patients in whom the medical management does not depend upon identification of allergen specificity.
Testing Algorithm
Includes testing for giant ragweed, short ragweed, and Western ragweed allergen.
Special Instructions
Method Name
Fluorescence Enzyme Immunoassay (FEIA)
Reporting Name
Weed Panel # 4Specimen Type
SerumSpecimen Minimum Volume
0.3 mL
Specimen Stability Information
Specimen Type | Temperature | Time | Special Container |
---|---|---|---|
Serum | Refrigerated (preferred) | 14 days | |
Frozen | 90 days |
Reject Due To
Gross hemolysis | OK |
Gross lipemia | OK |
Reference Values
Class |
IgE kU/L |
Interpretation |
0 |
<0.35 |
Negative |
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 |
Reference values apply to all ages.
Day(s) Performed
Monday through Friday
Report Available
1 to 3 daysPerforming Laboratory

Test Classification
This test was developed, and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the US Food and Drug Administration.CPT Code Information
86003
LOINC Code Information
Test ID | Test Order Name | Order LOINC Value |
---|---|---|
WEED4 | Weed Panel # 4 | 73710-6 |
Result ID | Test Result Name | Result LOINC Value |
---|---|---|
WEED4 | Weed Panel # 4 | 73710-6 |