West Nile Virus Viral Load Quantitative Test
Short Name: WNV Viral Load
Also known as: WNV PCR, West Nile Virus Quantitative PCR, WNV RNA Quantification
West Nile Virus Viral Load Quantitative Test test available at DNA Labs India for ₹9,860. Uses Real-Time PCR on Serum, Plasma, Whole Blood, CSF samples. Results in Reports are available on the 3rd working day. Email reports within 36 hours, phone within 24 hours.. Free home collection in 300+ cities across India.
🩺 Medically Reviewed By
Dr Kothari Ramesh Shantilal
Consultant Microbiologist · Reg: 27670
Last reviewed: September 7, 2026
Overview
The purpose of the West Nile Virus Viral Load Quantitative Test is to detect and quantify the presence of West Nile Virus RNA in the patient's blood or CSF. This aids in: 1) Confirming acute WNV infection, especially in patients with neurological symptoms. 2) Differentiating WNV from other viral encephalitides. 3) Monitoring viral load dynamics during the course of illness. 4) Assessing response to experimental therapies or supportive care. 5) Identifying infection in immunocompromised patients who may have prolonged viremia. 6) Supporting epidemiological surveillance and outbreak investigations.
- Test Code
- 6253
- CPT Code
- 87798
- ICD Code
- A92.3
- Price
- ₹9,860
- Sample Type
- Serum, Plasma, Whole Blood, CSF
- Result Time
- Reports are available on the 3rd working day. Email reports within 36 hours, phone within 24 hours.
- Fasting Required
- No
- Method
- Real-Time PCR
Sample Collection
No special preparation required. However, patients must sign a consent document and provide relevant clinical history. Inform your doctor about any medications or recent blood transfusions.
Method: Venipuncture or Lumbar Puncture (CSF)
Laboratory Analysis
A blood sample will be drawn from a vein in your arm. For CSF collection, a lumbar puncture will be performed by a healthcare professional. Minimal discomfort may be experienced.
Report Delivery
You can resume normal activities immediately after blood collection. If CSF was collected, follow your doctor's instructions regarding rest and hydration. Apply pressure to the puncture site to prevent bruising.
Timeline: Reports are available on the 3rd working day. Email reports within 36 hours, phone within 24 hours.
Patient Instructions
About This Test
Who Should Get This Test
The purpose of the West Nile Virus Viral Load Quantitative Test is to detect and quantify the presence of West Nile Virus RNA in the patient's blood or CSF. This aids in: 1) Confirming acute WNV infection, especially in patients with neurological symptoms. 2) Differentiating WNV from other viral encephalitides. 3) Monitoring viral load dynamics during the course of illness. 4) Assessing response to experimental therapies or supportive care. 5) Identifying infection in immunocompromised patients who may have prolonged viremia. 6) Supporting epidemiological surveillance and outbreak investigations.
How to Prepare
- Use sterile collection tubes as specified
- For serum: collect in plain red top tube; allow to clot for 30 minutes before centrifugation
- For plasma/whole blood: use EDTA lavender top tube
- For CSF: collect in sterile tube, label properly
- Transport samples to lab within 2 hours at 2-8°C
- Avoid repeated freeze-thaw cycles
Doctor's Notes
Reviewed by Dr Kothari Ramesh Shantilal — MBBS, MD (Microbiology) · Reg. No. 27670
"Quantitative WNV PCR is essential for early diagnosis and monitoring of viral load in suspected neuroinvasive disease. Timely testing can guide clinical management and reduce morbidity."
Last medically reviewed: September 7, 2026
Test Parameters & Specifications
Sample Stability
- Hemolyzed or lipemic samples
- Incorrect container or labeling
- Sample received after prolonged delay without proper storage
- Insufficient sample volume
- CSF contaminated with blood
Understanding Your Results
Indicates active WNV infection, often seen in acute phase. High viral load may correlate with severe disease, especially in immunocompromised patients.
May indicate early or resolving infection. Clinical correlation is necessary.
No WNV RNA detected in the sample. However, if symptoms persist, serological testing for IgM/IgG antibodies is recommended as RNA may be undetectable after the first week.
Consult a physician immediately if you experience symptoms such as high fever, severe headache, stiff neck, confusion, tremors, or seizures, especially after mosquito exposure. Early diagnosis and supportive care are crucial.
Limitations
- ⚠Negative result does not rule out WNV infection; serology may be needed in later stages
- ⚠Viral RNA may be undetectable in blood after the first week of symptoms
- ⚠Quantification is not standardized across all labs; results should be interpreted with clinical context
- ⚠Test may not be available in all regions; requires specialized equipment
Risks & Considerations
- ●Minimal risk of bruising or bleeding at venipuncture site
- ●Rare risk of infection at puncture site
- ●For lumbar puncture: headache, back pain, or rarely bleeding
Interfering Factors
- ●Hemolyzed or lipemic samples may affect PCR accuracy
- ●Improper storage or delayed processing can degrade RNA
- ●Cross-contamination during sample collection
- ●Recent blood transfusion may dilute viral RNA
- ●Antiviral therapy may reduce viral load
Compare With Similar Tests
| Test | West Nile Virus Viral Load Quantitative Test | WNV IgM Antibody Test | WNV IgG Antibody Test | WNV PCR (Qualitative) |
|---|---|---|---|---|
| Comparison | West Nile Virus Viral Load Quantitative Test | Detects antibodies produced in response to infection; positive after 4-7 days of symptoms. Useful for later diagnosis, but not for early detection. | Indicates past infection or vaccination; not useful for acute diagnosis. | Detects presence of viral RNA but does not quantify; less informative for monitoring. |
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