Western Equine Encephalitis Antibody, IgM by IFA, Serum
Ordering Recommendation
Submit With Order
Semi-Quantitative Indirect Fluorescent Antibody
Tue, Fri
1-5 days
New York DOH Approval Status
This test is New York DOH approved.
Specimen Required
Patient Preparation
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
Unacceptable Conditions
Plasma. Contaminated, heat-inactivated, hemolyzed, or severely lipemic specimens.  
After separation from cells: Ambient: 48 hours; Refrigerated: 2 weeks; Frozen: 1 year  
Reference Interval
Less than 1:16
Interpretive Data
This test is intended to be used as a semi-quantitative means of detecting western equine encephalitis virus-specific IgM in serum samples in which there is a clinical suspicion of western equine encephalitis virus infection. A positive result for IgM may suggest current or recent infection. This test should not be used solely for quantitative purpose, nor should the results be used without correlation to clinical history or other data. Because other members of the Alphavirus family, such as eastern equine encephalitis virus, show extensive cross-reactivity with western equine encephalitis virus, serologic testing for these species should also be performed.
CPT Code(s)
Component Test Code*Component Chart Name
0098734Western Equine Enceph Ab, IgM, Ser
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Cross References
  • Arbovirus IgM Serology
  • Encephalitis Antibody, Western Equine IgM
  • Encephalitis IgM Antibodies
  • WEE IgM
  • Western Equine Encephalitis IgM