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UW Health SMPH
American Family Children's Hospital

UW Hospital and Clinics Lab Test Directory

Test Name: Immunoglobulin E

Test Code(s): IGE

CPT Code(s): 82785

Methodology: Immunonephelometry

Clinical Significance: IgE is responsible for the clinical picture observed in immediate-type allergies. In allergic diseases such as atopic dermatitis or asthma, the serum IgE concentrations generally correlate with the intensity of exposure to the allergen and with the intensity of allergic symptoms.

Days Performed: Daily.

Turnaround Time: Stat: 1 hour.
Routine: 4 hours.


Specimen Requirements

Specimen: Blood

Collection Container: Preferred: Red cap with yellow ring (SST)
Also Acceptable: Red top

Collection Volume: Preferred: 3 mL
Pediatrics: 1 mL

Sample Analyzed: Serum

Volume Required: Preferred: 1 mL
Pediatrics: 0.3 mL

Specimen Processing: Centrifuge within 2 hours and transfer cell-free serum to plastic vial. Refrigerate.

Specimen Transport: Transport specimen to UWHC Core Laboratory (B4/220). Transport with coolant pack if coming from UWHC Satellite lab locations.

Outreach Specimen Transport: Transport specimen to UWHC Core Laboratory (B4/220). Transport with coolant pack if coming from outreach  locations.

Unacceptable Criteria: Grossly hemolyzed specimens are unacceptable.

Stability: Ambient: Not acceptable
Refrigerated: 7 days
Frozen: 3 months at -20C or below


Interpretation

Reference Interval:

 

Age: IU/mL
1-5 years: 0-59
6-9 years: 0-89
10-15 years: 0-199
16 years and up: 0-99

Test Limitations:

High Rheumatoid factor level

Immunoglobulin E

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