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Immunoglobulin E
Test Code542
CPT Codes
82785
Preferred Specimen
0.3 mL serum
Minimum Volume
0.3 mL
Other Acceptable Specimens
Plasma collected in: Sodium heparin (green-top) tube, lithium heparin (green-top) tube, or EDTA (lavender-top) tube
Transport Temperature
Room temperature
Specimen Stability
Room temperature: 14 days
Refrigerated: 14 days
Frozen: 30 days
Refrigerated: 14 days
Frozen: 30 days
Methodology
Immunoassay (IA)
Setup Schedule
A.M. Sets up 6 days a week.
Limitations
Some individuals with allergies have low total IgE but high concentration of allergen-specific IgE and may even suffer anaphylaxis with low to undetectable concentrations of IgE or allergen-specific IgE antibodies.
Clinical Significance
For diagnosis of allergic disease. A normal IgE level does not exclude the possible presence of an allergic disorder.
