Sign In
Regional Medical Lab
Test Directory


West Nile Virus Antibodies (IgG, IgM), CSF

Order Name WEST N CSF
Test Number: 3609925
Revision Date 09/05/2019
Test Name Methodology LOINC Code
West Nile Virus IgM Antibody CSF
Semi-Quantitative Enzyme-Linked Immunosorbent Assay 39573-1 
West Nile Virus IgG Antibody CSF
Semi-Quantitative Enzyme-Linked Immunosorbent Assay 39572-3 
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 2 mL (0.3 mL) CSF (Cerebrospinal Fluid) Sterile Screwtop Container Refrigerated
Instructions Stability (collection to initiation of testing): Ambient: 8 hours; Refrigerated: 2 weeks; Frozen: 1 year (avoid repeated freeze/thaw cycles)
Testing Schedule Tue, Fri 
Expected TAT 2-8 Days  
Clinical Use This test is intended to be used as a semi-quantitative means of detecting West Nile virus-specific IgG and IgM in CSF specimens in which there is a clinical suspicion of West Nile virus infection.  This test should not be used solely for quantitative purposes, nor should the results be used without correlation to clinical history or other data.  Because other members of the Flaviviridae family, such as St. Louis encephalitis virus, show extensive cross-reactivity with West Nile virus, serologic testing specific for these species should be considered.

The detection of antibodies to West Nile virus in cerebrospinal fluid may indicate central nervous system infection.  However, consideration must be given to possible contamination by blood or transfer of serum antibodies across the blood-brain barrier. 

Notes Reference Lab: ARUP
Test Code: 50228
Click Here to view information on the ARUP website.
CPT Code(s) 86789; 86788
Lab Section Reference Lab