West Nile Virus Antibody, IgG, Serum
Use
The detection of IgG antibodies is crucial for diagnosing West Nile virus (WNV) infections. WNV is a mosquito-borne flavivirus that primarily infects birds but can also affect humans and horses. A significant portion of infected individuals do not show symptoms, but about 20% may develop West Nile fever, characterized by mild symptoms like fever, headache, and myalgia. Laboratory diagnosis is effectively achieved through the detection of specific IgG and IgM antibodies in serum. The presence of IgG antibodies in serum indicates past infection with the virus. For acute-phase infections, samples collected early after infection can be compared with those collected after two weeks to observe rising antibody levels.
Special Instructions
Not provided.
Limitations
Test results should be interpreted alongside clinical evaluation and other diagnostic procedures. Factors such as immunosuppression can affect the significance of negative results. Positive results might not be reliable for individuals who have received blood transfusions recently. There is also a possibility of false positives due to serologic cross-reactivity with closely related flaviviruses or in individuals previously infected or vaccinated against similar viruses.
New York Approved
Methodology
Immunoassay (ELISA)
Biomarkers
West Nile Virus IgG
Antibody
LOINC Codes
- 29566-7 - WNV IgG Ser Ql IA
- 29566-7 - WNV IgG Ser Ql IA
Result Turnaround Time
1-4 days
Related Documents
For more information, please review the documents below
Specimen
Serum
Volume
0.5 mL
Minimum Volume
0.4 mL
Container
Plastic vial
Collection Instructions
Centrifuge and aliquot serum into a plastic vial.
Storage Instructions
Refrigerated (preferred) stability of 14 days or Frozen stability of 14 days.
Causes for Rejection
Gross hemolysis, gross lipemia, gross icterus, heat-inactivated specimen
Stability Requirements
| Temperature | Period |
|---|---|
| Refrigerated | 14 days |
| Frozen | 14 days |