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HelpTest Code WNIGMSO West Nile Virus/St. Louis Encephalitis IgM Antibody (SS02241)
Additional Codes
WSLH Test Code: SS02241
Useful For
Serodiagnosis of a recent infection with any of these agents in individuals with symptoms of arbovirus infection.
Testing will not be performed as a screening test or on patients without symptoms of WNV or SLE infection.
Specimen Requirements
| Specimen Type (Serum only, or Serum w/ CSF) | Preferred Container/Tube | Acceptable Container/Tube | Specimen Volume | Specimen Minimum Volume (allows for 1 repeat) |
|
|---|---|---|---|---|---|
| Serum |
Red Top Tube (RTT) or Serum Separator Tube (SST)
|
1-3 mL serum or 8.5 mL SST vacutainer tube, no additives
|
|||
| CSF (*If CSF is sent, Serum must accompany) | 2 mL |
Collection/Processing Instructions
CSF MUST be accompanied by serum specimen.
Specimens should be collected in the acute phase of illness.
Specimens must be stored and transported to the lab at 2-8° C (refrigerated/with coolpacks), and should be received within 48 hours of collection.
Test Information
Cross-reaction may occur between the arboviruses. Negative results on a single acute phase specimen do not rule out infection, as specimen may have been obtained prior to the development of an antibody response
Reference Range Information
| Reference Range |
|---|
| ** Negative: Test on single acute phase CSF or serum does not rule out infection. Lack of serological evidence of infection may reflect testing of acute phase specimen(s) obtained before development of an antibody response. ** Equivocal: It is recommended that a serum specimen be collected in 2-3 weeks for follow-up testing. ** Presumptive Positive: Serologic evidence for recent infection with West Nile virus or St. Louis Encephalitis virus. ** Non-Specific: It is recommended that a serum specimen be collected in 2-3 weeks for follow-up testing. |
Classification
The MIA test methodology was developed at the CDC and validated at WSLH. It has not been cleared or approved by the U.S. Food and Drug Administration. Testing is performed twice weekly. Please contact the laboratory for information about out-of-season arbovirus testing.
Performing Laboratory Name
Wisconsin State Lab of Hygiene
Referral Laboratory Information
| Address | Telephone | Website Link | Marshfield Lab Account # |
|---|---|---|---|
| 465 Henry Mall | 800-862-1013 | http://www.slh.wisc.edu/ | 815 |
Performing Information
| Performing Location | Day(s) Test Performed | Analytical Time | Methodology/Instrumentation |
|---|---|---|---|
| Wisconsin State Laboratory of Hygiene | Performed weekly | 2-8 days | Microsphere Immunoassay (MIA) |
CPT Codes
| CPT | Modifier (if needed) |
Quantity | Description | Comments |
|---|---|---|---|---|
| 86788 | 1 | West nile virus ab IgM | ||
| 86653 | 1 | Encephalitis St. Louis ab |
Outreach CPT Codes
| CPT | Modifier (if needed) |
Quantity | Description | Comments |
|---|---|---|---|---|
| 86788 | 1 | West nile virus ab IgM | ||
| 86653 | 1 | Encephalitis St. Louis ab |
Ordering Applications
| Ordering Application | Description |
|---|---|
| Cerner | West Nile Virus Confirm Assay |
| COM | West Nile Virus Confirm Assay |
| Centricity | West Nile Virus Confirm Assay |
| Portal | West Nile Virus Confirm Assay |