Ordering Recommendation

Not recommended as a stand-alone test. Refer to Arbovirus Antibodies, IgG and IgM, CSF (2001597).




Semi-Quantitative Indirect Fluorescent Antibody/Semi-Quantitative Enzyme-Linked Immunosorbent Assay


Tue, Fri


1-5 days

New York DOH Approval Status

Specimens from New York clients will be sent out to a New York DOH approved laboratory, if possible.

Specimen Required

Patient Preparation


Specimen Preparation

Transfer 4 mL CSF to an ARUP Standard Transport Tube. (Min: 1.5 mL)

Storage/Transport Temperature


Unacceptable Conditions

Contaminated, heat-inactivated , or hemolyzed specimens.


Ambient: 8 hours; Refrigerated: 2 weeks; Frozen: 1 year (avoid repeated freeze/thaw cycles)

Reference Interval

Components Reference Interval
St. Louis Encephalitis Antibody, IgM by IFA, CSF Less than 1:1
California Encephalitis Antibody, IgM by IFA, CSF Less than 1:1
Eastern Equine Encephalitis Antibody, IgM by IFA, CSF Less than 1:1
Western Equine Encephalitis, Antibody, IgM by IFA, CSF Less than 1:1
West Nile Virus Antibody, IgM by ELISA, CSF 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

This test was developed and its performance characteristics determined by ARUP Laboratories. It has not been cleared or approved by the US Food and Drug Administration. This test was performed in a CLIA certified laboratory and is intended for clinical purposes.

Compliance Category

Laboratory Developed Test (LDT)


Hotline History


CPT Codes

86651; 86652; 86653; 86654; 86788


Component Test Code* Component Chart Name LOINC
0050239 West Nile Virus Antibody IgM CSF 39573-1
0098729 Eastern Equine Enceph Ab, IgM, CSF 10899-3
0098730 Western Equine Enceph Ab, IgM, CSF 9316-1
0098898 California Encephalitis IgM CSF 49139-9
0098899 St. Louis Encephalitis Ab, IgM, CSF 21510-3
* 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.


Arbovirus Antibodies, IgM, CSF