0050226
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West Nile Virus Antibodies, IgG and IgM by ELISA, Serum

WNILE SER
Example Reports
Negative
Positive

Ordering Recommendation

Detect presence of IgG and IgM antibodies in individuals with a clinical suspicion of West Nile Virus.

New York DOH Approval Status

This test is New York state approved.

Specimen Required

Patient Preparation
Collect

Serum separator tube.

Specimen Preparation

Separate serum from cells ASAP or within 2 hours of collection. Transfer 1 mL serum to an ARUP Standard Transport Tube. (Min: 0.15 mL) Parallel testing is preferred and convalescent specimens must be received within 30 days from receipt of the acute specimens. Mark specimens plainly as "acute" or "convalescent."

Storage/Transport Temperature

Refrigerated.

Unacceptable Conditions

Bacterially contaminated, heat-inactivated, hemolyzed, icteric, lipemic, or turbid specimens.

Remarks
Stability

After separation from cells: Ambient: 48 hours; Refrigerated: 2 weeks; Frozen: 1 year (avoid repeated freeze/thaw cycles)

Methodology

Semi-Quantitative Enzyme-Linked Immunosorbent Assay

Performed

Sun, Tue, Fri

Reported

1-6 days

Reference Interval

Test Number
 Components
 Reference Interval
  West Nile Virus Ab, IgG, Ser 1.29 IV or less
  West Nile Virus Ab, IgM, Ser 0.89 IV or less

Interpretive Data




Component Result Interpretation
West Nile Virus Antibody, IgG by ELISA, Serum 1.29 IV or less: Negative - No significant level of West Nile virus IgG antibody detected.
1.30-1.49 IV: Equivocal - Questionable presence of West Nile virus IgG antibody detected. Repeat testing in 10-14 days may be helpful.
1.50 IV or greater: Positive - Presence of IgG antibody to West Nile virus detected, suggestive of current or past infection.
West 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.

Compliance Category

FDA

Note

Hotline History

N/A

CPT Codes

86789; 86788

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Components

Component Test Code* Component Chart Name LOINC
0050234 West Nile Virus Ab, IgG, Ser 38997-3
0050236 West Nile Virus Ab, IgM, Ser 38166-5
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.

Aliases

  • Arbovirus
  • Flavivirus
  • West Nile Virus Antibodies
  • WNV
  • WNV IgG and IgM
West Nile Virus Antibodies, IgG and IgM by ELISA, Serum