Leptospira Antibody IgM Test
Short Name: Lepto IgM
Also known as: Lepto IgM Antibody Test, Leptospirosis IgM Test, Leptospira Serology IgM, Weil Disease Antibody Test, Leptospira interrogans IgM
Leptospira Antibody IgM Test test available at DNA Labs India for ₹1,580. Uses Enzyme Immunoassay (EIA/ELISA) on Serum samples. Results in Same-day reports available for samples received on Tuesday, Thursday, and Saturday by 9:00 AM. Digital reports are shared via Online Portal, Email, and WhatsApp.. 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 Leptospira Antibody IgM test is ordered to detect acute leptospirosis infection in patients presenting with compatible symptoms or a history of potential exposure. This test helps clinicians differentiate leptospirosis from other causes of acute febrile illness such as dengue, malaria, typhoid, and viral hepatitis, enabling appropriate and timely treatment. It is also used for epidemiological surveillance in outbreak settings.
- Test Code
- 1168
- CPT Code
- 86720
- ICD Code
- A27.9
- Price
- ₹1,580
- Sample Type
- Serum
- Result Time
- Same-day reports available for samples received on Tuesday, Thursday, and Saturday by 9:00 AM. Digital reports are shared via Online Portal, Email, and WhatsApp.
- Fasting Required
- No
- Method
- Enzyme Immunoassay (EIA/ELISA)
Sample Collection
No special preparation, fasting, or dietary restrictions are required before the Leptospira Antibody IgM test. Patients should inform their healthcare provider about any current medications, recent vaccinations, or prior history of leptospirosis or other spirochetal infections, as these may influence test interpretation.
Method: Venipuncture
Laboratory Analysis
A trained phlebotomist will collect approximately 2 mL of venous blood from a vein in the arm (usually the antecubital fossa) using standard venipuncture technique. The blood is collected into a Serum Separator Tube (SST). The procedure typically takes less than 5 minutes. Patients may feel a brief prick or mild discomfort at the puncture site.
Report Delivery
After sample collection, firm pressure is applied to the puncture site with cotton wool or a bandage for 3–5 minutes to prevent bruising. Patients can resume normal activities immediately. The serum is separated, and the sample is stored refrigerated (2–8°C) for up to 1 week or frozen (−20°C) for up to 4 weeks if analysis is not immediate.
Timeline: Same-day reports available for samples received on Tuesday, Thursday, and Saturday by 9:00 AM. Digital reports are shared via Online Portal, Email, and WhatsApp.
Patient Instructions
About This Test
Who Should Get This Test
The Leptospira Antibody IgM test is ordered to detect acute leptospirosis infection in patients presenting with compatible symptoms or a history of potential exposure. This test helps clinicians differentiate leptospirosis from other causes of acute febrile illness such as dengue, malaria, typhoid, and viral hepatitis, enabling appropriate and timely treatment. It is also used for epidemiological surveillance in outbreak settings.
How to Prepare
- No fasting required before sample collection
- Wear loose-fitting sleeves to allow easy access to the arm
- Inform the phlebotomist of any history of fainting during blood draws
- Stay hydrated and drink plenty of water before the test
- Bring a valid doctor's prescription or test requisition form
- Disclose any blood-thinning medications or coagulation disorders
Doctor's Notes
Reviewed by Dr Kothari Ramesh Shantilal — MBBS, MD (Microbiology) · Reg. No. 27670
"Leptospirosis is a potentially life-threatening zoonotic infection that is often underdiagnosed in India, especially during monsoon season. Early detection through IgM antibody testing allows timely initiation of antibiotic therapy with doxycycline or penicillin, which can significantly reduce the risk of severe complications such as Weil disease (hepatorenal syndrome) and pulmonary haemorrhage. I strongly recommend this test for any patient presenting with acute febrile illness, myalgia, conjunctival suffusion, or jaundice following exposure to floodwater, soil, or animal urine. A negative IgM result in the first week of illness does not rule out leptospirosis; repeat testing after 5–7 days may be necessary. Clinical correlation is essential for accurate diagnosis."
Last medically reviewed: September 7, 2026
Test Parameters & Specifications
Sample Stability
- Haemolysed, lipaemic, or heavily icteric serum samples
- Samples collected in incorrect or non-SST containers
- Samples received at room temperature beyond 6 hours post-collection
- Insufficient sample volume (less than 1 mL serum)
- Unlabelled or mislabelled samples without proper patient identification
Understanding Your Results
Negative (< 1.0 ISR)
No detectable IgM antibodies against Leptospira. If clinical suspicion remains high and the sample was collected within the first 3–5 days of illness, repeat testing after 7–10 days is recommended as IgM may not yet have developed. A negative result in the appropriate clinical context does not fully exclude leptospirosis.
Equivocal (1.0 – 1.2 ISR)
Borderline result that cannot be interpreted as definitively positive or negative. A repeat sample collected 7–10 days later is recommended to assess for seroconversion or rising antibody levels. Clinical correlation with symptoms and exposure history is essential.
Positive (> 1.2 ISR)
Reactive result indicating the presence of IgM antibodies against Leptospira, consistent with recent or acute leptospirosis infection. Clinical correlation is required to distinguish between acute infection and persistent antibodies from a past infection. Confirmation with MAT (Microscopic Agglutination Test) may be considered for definitive diagnosis.
Consult your doctor immediately if you have a positive or equivocal Leptospira IgM result, or if you are experiencing persistent fever, severe muscle pain, jaundice, red eyes, dark-coloured urine, reduced urine output, unexplained bleeding, or respiratory distress. These symptoms may indicate progression to severe leptospirosis (Weil disease or pulmonary haemorrhage syndrome), which requires urgent medical intervention. Early antibiotic treatment is critical for preventing life-threatening complications.
Limitations
- ⚠IgM antibodies may persist for weeks to months after acute infection; a positive result does not always indicate active disease
- ⚠Sensitivity in the first 5 days of illness is limited; a negative result early in the disease course does not exclude leptospirosis
- ⚠The test does not distinguish between different Leptospira serovars
- ⚠Serological confirmation may require paired acute and convalescent sera showing a four-fold rise in titre
- ⚠Results must always be interpreted in conjunction with clinical findings, patient history, and epidemiological context
Risks & Considerations
- ●Mild pain or bruising at the venipuncture site
- ●Slight risk of infection at the puncture site (extremely rare with standard sterile technique)
- ●Possibility of fainting in individuals sensitive to blood draws
Interfering Factors
- ●Very early infection (within first 1–3 days of symptom onset) may yield false-negative results as IgM antibodies take time to develop
- ●Cross-reactivity with other spirochetal infections such as syphilis, Lyme disease, and other treponemal infections may produce false-positive results
- ●Prior vaccination against leptospirosis may cause persistent low-level IgM antibodies
- ●Immunocompromised patients may have delayed or diminished antibody response leading to false negatives
- ●Rheumatoid factor (RF) and heterophilic antibodies can occasionally interfere with EIA-based assays
Compare With Similar Tests
| Test | Leptospira Antibody IgM Test | Leptospira IgG Antibody Test | Leptospira PCR Test | MAT (Microscopic Agglutination Test) | Dengue IgM Antibody Test |
|---|---|---|---|---|---|
| Comparison | Leptospira Antibody IgM Test | IgG antibodies appear later in infection and indicate past exposure or later-stage disease. The IgM test is preferred for detecting acute infection, while IgG is useful for confirming recent infection or assessing immune status. | PCR detects Leptospira DNA directly in blood or urine and is most sensitive in the first week of illness before antibodies develop. IgM serology is more widely available and is the standard initial screening test. | MAT is the gold standard reference test for leptospirosis and can identify specific serovars. It requires live Leptospira cultures and is technically demanding, making it impractical for routine screening. IgM ELISA is used as the primary screening tool. | Dengue and leptospirosis share overlapping symptoms (fever, myalgia, thrombocytopenia). The Leptospira IgM test helps differentiate leptospirosis from dengue in endemic tropical regions where both infections co-circulate. |
Frequently Asked Questions
What is the Leptospira Antibody IgM test?
How much does the Leptospira Antibody IgM test cost in India?
Is fasting required for the Leptospira IgM test?
When should I get the Leptospira IgM test done?
Can the Leptospira IgM test be negative even if I have leptospirosis?
What does a positive Leptospira IgM result mean?
How is the blood sample collected for this test?
How soon will I receive my test results?
Is home sample collection available for the Leptospira IgM test?
What is the difference between the Leptospira IgM and IgG antibody tests?
Can leptospirosis be cured if detected early?
Who is at higher risk of contracting leptospirosis?
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