ARUP's Laboratory Test Directory

0050226: West Nile Virus Antibodies, IgG & IgM by ELISA, Serum

Test Mnemonic: WNILE SER
Methodology: Enzyme-Linked Immunosorbent Assay

Performed: Tue, Fri

Reported: 1-8 days

Specimen Required:  
Collect: One 4 mL SST.

Transport: 1 mL serum at 2-8°C.  (Min: 0.5 mL) Submit specimen in ARUP Standard Transport Tube.

Pediatric Collection/Transport: 0.15 mL serum at 2-8°C.

Remarks: Separate serum from cells ASAP. Acute and convalescent specimens must be labeled as such; parallel testing is preferred and convalescent specimens must be received within 30 days from receipt of the acute specimens.  Please mark specimen plainly as "acute" or "convalescent."

Unacceptable Conditions: Plasma.  Hemolyzed, severely lipemic, heat-inactivated, or contaminated specimens.

Stability: After separation from cells: Ambient: 2 days; Refrigerated: 2 weeks; Frozen: 1 year (avoid repeated freeze/thaw cycles)

Reference Interval:
 
Test Number Components Reference Interval
0050234West Nile Virus Antibody, IgG by ELISA, Serum 1.29 IV or less: Negative - No significant level of West Nile virus IgG antibody detected.
1.30-1.50 IV: Equivocal - Questionable presence of West Nile virus IgG antibody detected.  Repeat testing in 10-14 days may be helpful.
1.51 IV or greater: Positive - Presence of IgG antibody to West Nile virus detected, suggestive of current or past infection. 
0050236West Nile Virus Antibody, IgM by ELISA, Serum 0.89 IV or less: Negative - No significant 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 of current or recent infection. 
 

Interpretive Data:
Refer to individual components for additional interpretive data.



CPT Code(s):
86789 WNV IgG, 86788 WNV IgM

 

 

 
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