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Test Code WALAL or LAB604 IgE Walnut, Serum

Specimen Requirements

Container Type:

Optimal: Gold

Acceptable: Red 

 
Optimal Collection Volume: 

4.5mL; full tube
Minimum Volume:

3 mL
Collection Instructions:

Gently invert the sample 5-6 times after collection.
Specimen Transport:

Refrigerate
Processing Instructions: 

1. Allow the specimen to clot for 30 minutes.

2. Centrifuge specimen within 2 hours of collection.

3. After centrifugation, specimen tubes without a gel barrier should have the serum aliquoted to a false bottom container.

4. Keep serum refrigerated until testing can be performed.

Specimen Stability

Specimen Type Temperature Time
Serum Refrigerated 7 days
Room Temperature 24 hours

Specimen Rejection Criteria

Quantity not sufficient

Useful For

Determining a diagnosis of an allergy to walnut.

Methodology

Phadia ImmunoCAP - Fluorescence enzyme immunoassay

Reference Ranges

Specific IgE - All Ages
Value (kU/L) Interpretation Class
< 0.10 Negative Negative
0.10 - 0.35 Equivocal/Very Low Class 0/1
0.36 - 0.70 Low level of allergy, indicative of ongoing sensitization Class 1
0.71 - 3.50 Moderate level of allergy, indicative of stronger ongoing sensitization Class 2
3.51 - 17.50 High level of allergy, indicative of high-level sensitization Class 3
17.51 - 50.00 Very high level of allergy, indicative of very high-level sensitization Class 4
50.01 - 100.00 Very high level of allergy, indicative of very high-level sensitization Class 5
> 100.00 Very high level of allergy, indicative of very high-level sensitization Class 6

Interpretive

Specific IgE

Positive results indicate the possibility of allergic disease.

 

Negative results may rule out allergy, except in rare cases of allergic disease induced by exposure to a single allergen.

 

Detection of IgE antibodies in serum (Class 1 or greater) indicates an increased likelihood of allergic disease as opposed to other etiologies and defines the allergens that may be responsible for eliciting signs and symptoms.

 

The level of IgE antibodies in serum varies directly with the concentration of IgE antibodies expressed as a class score or kU/L.

 

Source: Mayo Clinical Labs

Day(s) Performed

Monday through Friday

Expected TAT

Same day or 1-3 days

Performing Laboratory

Bronson Laboratory, Chemistry - Kalamazoo

Sample Retention Time

7 days

CPT Code

86003

LOINC Code

6273-7