West Nile Virus Antibodies (IgG, IgM), Serum

Test Code

Quest Code

CPT Codes
86789, 86788

Preferred Specimen
1 mL serum

Minimum Volume
0.7 mL

Transport Temperature
Refrigerated (cold packs)

Specimen Stability
Room temperature: 4 days
Refrigerated: 7 days
Frozen: 30 days

Enzyme Immunoassay (EIA)

Setup Schedule
Set up: Tues, Thurs, Sat; Report available: 1-4 days

Cross reactivity has been observed between alphavirus group and flavivirus group, e.g., yellow fever or yellow fever vaccination.

Reference Range
WNV (IgG) <1.30
WNV (IgM) <0.90

Interpretive Criteria
WNV Ab (IgG)
<1.30 Antibody not detected
1.30-1.49 Equivocal
≥1.50 Antibody detected
WNV Ab (IgM)
<0.90 Antibody not detected
0.90-1.10 Equivocal
>1.10 Antibody detected

Performing Laboratory
Quest Diagnostics Infectious Disease, Inc.
33608 Ortega Highway, Bldg B-West Wing
San Juan Capistrano, 92675-2042

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.