West Nile Virus IgM

Brief Description

The Focus Diagnostics West Nile Virus IgM Capture DxSelect™ is intended for qualitatively detecting IgM antibodies to West Nile virus in human serum. In conjunction with the Focus Diagnostics West Nile Virus IgG DxSelect™, the test is indicated for testing persons having symptoms of meningoencephalitis, as an aid in the presumptive laboratory diagnosis of West Nile virus infection.

Laboratory Unit




Specimen Collection


Collect in gold top SST tube, centrifuge.

Collect in tiger top SST tube, centrifuge.


Aseptically transfer serum to a tightly closing sterile container for storage. Serum can remain at 22°C for no longer than 8 hours after collection.

Serum separated from the clot can be maintained at refrigerated temperature (2-8°C) during transit for no more than 48 hours after collection. 

Serum separated from the clot can be stored frozen (-20°C or colder) and shipped with dry ice.

Acceptable Specimen Type(s)


Test Request

Possible Results

  • Positive
  • Negative
  • Equivocal
  • Unsatisfactory

Reference Range


Unacceptable Conditions

  • Missing testing requisition
  • Missing minimum of 2 patient identifiers
  • Improper labeling
  • Improper storage/transport of specimen.
  • No specimen received (empty collection tube).
  • Wrong specimen type
  • Grossly hemolyzed or lipemic samples.
  • Samples containing particulate matter.
  • Samples exhibiting obvious microbial contamination.

Interfering Substances


Result Reported

5-7 business days


Fee schedule

LOINC/Order Codes

31704-0 (Order code: 1585)