Arbovirus Antibodies, IgM, Serum
Ordering Recommendation
Semi-Quantitative Indirect Fluorescent Antibody/Semi-Quantitative Enzyme-Linked Immunosorbent Assay
Tue, Fri
1-5 days  
New York DOH Approval Status
This test is New York DOH approved.
Submit With Order
Specimen Required
Patient Preparation
Serum separator tube. Also acceptable: Plain red.  
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 acute specimens. Mark specimens plainly as "acute" or "convalescent."  
Storage/Transport Temperature
Unacceptable Conditions
Plasma. Contaminated, heat-inactivated, hemolyzed, or severely lipemic specimens.  
After separation from cells: Ambient: 48 hours; Refrigerated: 2 weeks; Frozen: 1 year (avoid repeated freeze/thaw cycles)  
Reference Interval
Test Number Components Reference Interval
0098732St. Louis Encephalitis Antibody, IgM by IFA, Serum Less than 1:16
0098731California Encephalitis Antibody, IgM by IFA, Serum Less than 1:16
0098733Eastern Equine Encephalitis Antibody, IgM by IFA, Serum Less than 1:16
0098734Western Equine Encephalitis Antibody, IgM by IFA, Serum Less than 1:16
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
CPT Code(s)
86651; 86652; 86653; 86654; 86788
Component Test Code*Component Chart Name
0050236West Nile Virus Ab, IgM, Ser
0098731California Encephalitis IgM
0098732St. Louis Encephalitis Ab, IgM, Serum
0098733Eastern Equine Enceph Ab, IgM
0098734Western Equine Enceph Ab, IgM, Ser
* 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.