Test Code WNVAB West Nile Virus IgM Antibody, Cerebrospinal Fluid (CSF) or Serum

Methodology

Enzyme Immunoassay (EIA)

Useful for laboratory diagnosis of acute phase infection with West Nile virus.

Submit only 1 of the following specimens:

CSF

Container/Tube: Sterile vial(s)
Specimen Volume: 1 mL of CSF

Collection Instructions: Label vial with patient’s legal name, date and actual time of collection, and type of specimen.

Note:

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

2. Label specimen appropriately (CSF).

Serum

Container/Tube: Plain, red-top tube(s) or serum gel tube(s)

Specimen Volume: A minimum of 2 mL of serum

Collection Instructions:

Note:

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

2. Label specimen appropriately (serum).

At least weekly; more frequently during seasonal outbreaks.

Negative

If equivocal (borderline), St. Louis encephalitis IgM serology will be performed.

Note: Negative results on specimens drawn <9 days of onset should have a convalescent serum tested if active disease is suspected.

Montana State Laboratory, Helena

86790-West Nile virus antibody

86790-St. Louis encephalitis (if appropriate)

Refrigerate