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Utah Public Health Laboratory

West Nile Virus (Human) IgM

Fee: Please refer to fee schedule

Ordering Recommendation

West Nile Virus IgM testing is intended for the qualitative detection of West Nile Virus (WNV) IgM in human blood and cerebral spinal fluid (CSF) specimens by micro-sphere immunoassay, from patients with clinically apparent illness having symptoms that range from a simple febrile headache to neuroinvasive disease. Prior to submitting specimen, testing must be approved by UDOH Epidemiology at (801)538-6191.

Performed

Monday – Friday depending on season.

Methodology

Microsphere Immunoassay (MIA)

Reported

3 days

Specimen Required

  • Collect:Serum or CSF, minimum specimen volume of 100µl
  • Specimen Preparation:Sterile container
  • Storage/Transport Conditions:refrigerate (freeze if transport delayed)
  • Unacceptable Conditions:Specimen volume less than 100µL.
  • Remarks: Testing must be approved by UDOH Epidemiology at (801) 538-6191.
  • Stability: Ambient: 8 hours; Refrigerated: 2 weeks; Frozen: 1 year (avoid repeated freeze/thaw cycles)

Results

Positive, not detected, or non-specific

Interpretive Data

No IgM antibodies against West Nile Virus detected by Micro-sphere Immunoassay.

Presumptively positive for IgM antibodies to West Nile Virus by Micro-sphere Immunoassay. (serum)

Confirmed positive for IgM antibodies against West Nile Virus by Micro-sphere Immunoassay. (CSF)

Non-specific for IgM antibodies against West Nile Virus by Micro-sphere Immunoassay.

Note

If initial serum specimen was collected within 9 days of onset of symptoms, a convalescent serum will be requested for IgM negative and nonspecific tests.

Cross References