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Test Code BLOD0771 West Nile Virus, IgG

Useful For

The diagnosis of infection with West Nile virus, a mosquito-borne flavivirus.


Enzyme Immunoassay (EIA)

Performing Laboratory

Montana State Public Health Laboratory

Specimen Requirements

Specimen Type: Serum
Container/Tube: Red top or gold top
Specimen Volume: 1 mL

Collection Instructions:  Send 1 mL refrigerated.  Paired acute and convalescent specimens recommended.

Date of onset is required, and the city or county of patient’s residence is requested.

Specimen Transport Temperature


Specimen Stability

Specimen Type Temperature Time
Serum Ambient 8 hours
  Refrigerated 1 week


Reference Values

Negative (reported as positive or negative)


Positive results are telephoned to the submitter.

Day(s) Test Set Up

Routinely batch tested once per week; during seasonal outbreaks, testing may be performed each working day, depending on workload.


Test Classification and CPT Coding