Reference Interval:
Less than 1:16
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| Interpretive Data: |
A positive result for IgG may suggest current or past infection. La Crosse virus is related to viruses within the California Encephalitis Group and, generally, is reactive with antibody to other viruses within this group.
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| Note: |
Serum specimens drawn within the first two weeks after onset are variably negative for IgG antibody and should not be used to exclude the diagnosis of arboviral disease. Seroconversion between acute and convalescent sera is considered strong evidence of recent infection. The best evidence for infection is a significant change (fourfold difference in titer) on two appropriately timed specimens, where both tests are done in the same laboratory at the same time.
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| CPT Code(s): |
86651
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Cross References: |
Encephalitis Antibody (California Encephalitis Antibody, IgG by IFA, Serum), Encephalitis, La Crosse (California Encephalitis Antibody, IgG by IFA, Serum), La Crosse Encephalitis (California Encephalitis Antibody, IgG by IFA, Serum) |