West Nile Virus Antibody, IgM by ELISA, CSF

Sunquest Code:CWNM  
Epic Code:LAB6833Epic Name:West Nile Virus Ab, IgM, CSF
Methodology:Enzyme linked immunosorbent assay
Turnaround Time:Specimens are sent to reference laboratory Mon-Sat; results are reported within 1-6 days.

This test was developed and its performance characteristics determined by ARUP Laboratories. The U.S. Food and Drug Administration has not approved or cleared this test; however, FDA clearance or approval is not currently required for clinical use. The results are not intended to be used as the sole means for clinical diagnosis or patient management decisions.

Collection Instructions

Optimal Volume:2 mL
Minimum\Peds Volume:0.15 mL
Container:Sterile tube
Causes for Rejection:Heat inactivated or hemolyzed specimens.

Processing and Shipping

Specimen Processing:Aliquot 2 mL, 0.15 mL minimum CSF into a sterile container. Store in refrigerator.
Shipping Instructions:Ship at refrigerated temperature.
Stability:Stability: 8 hours at room temperature;2 weeks refrigerated; 1 year frozen.
Test Performed at or Referral Lab Lab Sendouts  (ARUP)
Referral Lab number:50239


Reference Range:

0.89 IV or less

Negative. No significnat level of West Nile virus IgM antibody detected

0.90-1.10 IV

Equivocal. Questionable presence of West Nile Virus IgM antibody detected. Repeat testing in 10-14 days may be helpful.

1.11 IV or greater

Positive. Presence of IgM antibody to West Nile virus detected, suggestive or current or recent infection.



Use: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.

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