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| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # |
St. Louis Encephalitis Virus Antibodies (IgG, IgM), IFA, Serum
Test Code34982
CPT Codes
86653 (x2)
Preferred Specimen
1 mL serum
Minimum Volume
0.5 mL
Transport Temperature
Refrigerated (cold packs)
Specimen Stability
Room temperature: 7 days
Refrigerated: 14 days
Frozen: 30 days
Refrigerated: 14 days
Frozen: 30 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Gross hemolysis • Grossly lipemic • Grossly icteric
Methodology
Immunofluorescence Assay (IFA)
Setup Schedule
Set up: Mon-Fri; Report available: 3-5 days
Limitations
False-positive results may occur in patients following yellow fever vaccination. Alphavirus and Flavavirus have cross reactions.
Reference Range
| St. Louis Encephalitis Virus (IgG) | <1:16 titer |
| St. Louis Encephalitis Virus (IgM) | <1:16 titer |
Clinical Significance
IgG titers ≥1:16 suggest exposure (either past or recent), while the presence of IgM indicated recent infection.
