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Lab Manual for Moffitt-Long and Mount Zion

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West Nile Virus Antibody, CSF

Item Value
Approval req'd? Yes, Contact Microbiology at x 3-1268
Available Stat? No
Test code WNVC
Test group WNV
Performed by Quest
Sendout? Yes
Method ELISA
Container type CSF tube or sterile collection tube
Amount to Collect 2 mL CSF
Sample type CSF
Preferred volume 2 mL CSF
Min. Volume 0.7 mL CSF
Processing notes Order Quest test #36597N, freeze CSF at -20C.
Units Index
Normal range West Nile Virus IgG, CSF:
Negative <1.30
Equivocal 1.30-1.49
Positive ≥1.50


West Nile Virus IgM, CSF:
Negative <0.90
Equivocal 0.90-1.10
Positive >1.10
Synonyms WNV
Stability Room temperature 4 days, refrigerated 1 week, frozen @ -20C 1 month, frozen @ -70C indefinite
Turn around times Test set up 3 days a week at night, reports in 5-7 days.
Reflex? See 'Additional information'
Additional information West Nile Virus (WNV) IgM antibodies, in blood or CSF, are positive in most infected people within 8 days of onset of symptoms and may remain detectable for months. In our laboratory, CSF samples with reactive IgM are rerun in a modified test to rule out nonspecific reactions. IgG antibodies indicate either current or past exposure to the virus.
CPT coding 86788-90, 86789-90
Last Updated 11/21/2013 1:33:46 PM
Entry Number 1337
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