Japanese Encephalitis Virus Antibody IgM Test
Short Name: JE IgM Test
Also known as: JE IgM Antibody Test, Japanese Encephalitis Serology, JEV IgM ELISA, Japanese Encephalitis Antibody Test
Japanese Encephalitis Virus Antibody IgM Test test available at DNA Labs India for ₹2,925. Uses Enzyme Immunoassay (EIA) on Serum samples. Results in Same-day reports available. Sample accepted on Monday and Thursday by 11 AM.. 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 primary purpose of the Japanese Encephalitis Virus Antibody IgM Test is to confirm acute or recent infection with the Japanese Encephalitis Virus by detecting IgM antibodies in serum. IgM is the first antibody class produced during an immune response and serves as a reliable marker of recent infection. This test aids clinicians in distinguishing JE from other causes of viral encephalitis such as dengue, West Nile virus, and herpes simplex encephalitis. It is also used for epidemiological surveillance by public health authorities to monitor JE activity in endemic areas.
- Test Code
- 1135
- CPT Code
- 86652
- ICD Code
- A83.0
- Price
- ₹2,925
- Sample Type
- Serum
- Result Time
- Same-day reports available. Sample accepted on Monday and Thursday by 11 AM.
- Fasting Required
- No
- Method
- Enzyme Immunoassay (EIA)
Sample Collection
No special preparation or fasting is required. Inform your physician about any recent vaccinations, travel history, and current medications. Carry a valid doctor's prescription or requisition form.
Method: Venipuncture
Laboratory Analysis
A blood sample of approximately 3 mL will be drawn from a vein in your arm (venipuncture) using a sterile needle and collected into a Serum Separator Tube (SST). The procedure typically takes 3 to 5 minutes. You may feel a brief sting or pinch at the needle insertion site.
Report Delivery
After blood collection, slight bruising or soreness at the puncture site is normal and resolves within a day. Apply gentle pressure with the cotton ball provided. Avoid heavy lifting with the affected arm for a few hours.
Timeline: Same-day reports available. Sample accepted on Monday and Thursday by 11 AM.
Patient Instructions
About This Test
Who Should Get This Test
The primary purpose of the Japanese Encephalitis Virus Antibody IgM Test is to confirm acute or recent infection with the Japanese Encephalitis Virus by detecting IgM antibodies in serum. IgM is the first antibody class produced during an immune response and serves as a reliable marker of recent infection. This test aids clinicians in distinguishing JE from other causes of viral encephalitis such as dengue, West Nile virus, and herpes simplex encephalitis. It is also used for epidemiological surveillance by public health authorities to monitor JE activity in endemic areas.
How to Prepare
- No fasting required before sample collection
- Stay well-hydrated to facilitate venipuncture
- Wear loose-fitting clothing with sleeves that can be easily rolled up
- Inform the phlebotomist about any history of fainting during blood draws
- Carry a valid photo ID and doctor's prescription
Doctor's Notes
Reviewed by Dr Kothari Ramesh Shantilal — MBBS, MD (Microbiology) · Reg. No. 27670
"Japanese Encephalitis remains a significant public health concern in endemic regions of India. The JE IgM antibody test is the WHO-recommended frontline serological diagnostic for confirming acute infection. Early detection through this test allows clinicians to initiate timely supportive management, reduce mortality, and assist public health authorities in outbreak surveillance. I recommend this test for any patient presenting with acute febrile illness, altered sensorium, or seizures, particularly during monsoon and post-monsoon seasons in endemic areas."
Last medically reviewed: September 7, 2026
Test Parameters & Specifications
Sample Stability
- Hemolyzed, lipemic, or icteric samples
- Samples received in incorrect container (non-SST)
- Insufficient sample volume (less than 1 mL)
- Samples stored beyond stability limits
- Unlabelled or mislabelled samples
Understanding Your Results
Positive
IgM antibodies against JEV detected. This indicates a recent or acute infection with Japanese Encephalitis Virus. Correlation with clinical symptoms and exposure history is essential. Confirmatory testing (PRNT) may be recommended in flavivirus-endemic areas due to possible cross-reactivity.
Negative
No IgM antibodies against JEV detected. This may indicate absence of infection, or testing performed too early in the course of illness before seroconversion. If clinical suspicion remains high, repeat testing after 5–7 days is recommended.
Equivocal / Borderline
Result falls in the borderline zone. Repeat testing after 7–14 days is advised to assess for seroconversion. Clinical correlation is essential.
Consult an infectious disease specialist or neurologist immediately if you experience sudden high fever, severe headache, neck stiffness, confusion, seizures, or altered consciousness, especially if you live in or have recently visited a JE-endemic area. Early medical intervention can significantly improve outcomes. A positive or equivocal test result warrants prompt clinical evaluation.
Limitations
- ⚠A single positive IgM result does not distinguish between primary infection and reinfection in previously exposed individuals
- ⚠Cross-reactivity with other flaviviruses (Dengue, West Nile) may require confirmatory testing such as Plaque Reduction Neutralization Test (PRNT)
- ⚠IgM antibodies may persist for weeks to months; a positive result does not necessarily indicate active disease
- ⚠This test is for qualitative detection only and does not provide antibody titre levels
- ⚠A negative result does not completely rule out JE infection, especially if the sample is collected very early or very late in the disease course
Risks & Considerations
- ●Minor bruising or soreness at the venipuncture site
- ●Slight risk of fainting in sensitive individuals
- ●Very rare risk of infection at the puncture site
Interfering Factors
- ●Cross-reactivity with other flavivirus infections such as Dengue, West Nile, or Yellow Fever may produce false-positive results
- ●Testing too early (within 1–2 days of symptom onset) may yield a false-negative result as IgM antibodies have not yet reached detectable levels
- ●Immunocompromised patients may produce a delayed or diminished IgM response, leading to false-negative results
- ●Recent JE vaccination may cause a positive IgM result in the absence of active infection
- ●Hemolyzed or lipemic serum samples may interfere with assay accuracy
Compare With Similar Tests
| Test | Japanese Encephalitis Virus Antibody IgM Test | Dengue IgM Antibody Test | West Nile Virus IgM Antibody Test | Chikungunya IgM Antibody Test |
|---|---|---|---|---|
| Comparison | Japanese Encephalitis Virus Antibody IgM Test | Detects IgM antibodies against Dengue virus. May show cross-reactivity with JE IgM. Differentiated by PRNT if needed. | Detects IgM antibodies against West Nile Virus, another flavivirus. Clinically differentiated by geography and confirmatory neutralization assays. | Detects IgM antibodies against Chikungunya virus (alphavirus). Causes arthritis-like symptoms rather than encephalitis; no significant cross-reactivity with JE. |
Frequently Asked Questions
What is the Japanese Encephalitis Virus Antibody IgM Test?
What is Japanese Encephalitis and how is it transmitted?
When should I get the JE IgM Antibody Test done?
What does a positive JE IgM result mean?
Is fasting required before the JE IgM Test?
What sample is required for the JE IgM Test?
How much does the Japanese Encephalitis IgM Test cost?
Can the JE IgM Test give a false result?
How long does it take to get the JE IgM Test results?
Is home sample collection available for this test?
Can the JE IgM Test distinguish Japanese Encephalitis from Dengue?
Is Japanese Encephalitis preventable?
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