Leptospirosis (Weil’s Disease) Antibodies (IgM)
The Leptospirosis IgM test detects recent infection with Leptospira bacteria. It supports early diagnosis of Weil’s disease following exposure.
Turnaround time
10 days
Biomarkers count
1
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Details about Leptospirosis (Weil’s Disease) Antibodies (IgM)
What is the Leptospirosis (Weil’s Disease) Antibodies (IgM) test?
The Leptospirosis IgM antibody test is a blood test that detects IgM antibodies produced in response to infection with Leptospira bacteria. IgM antibodies typically appear early in the course of infection, making this test useful for identifying recent or acute leptospirosis.
Leptospirosis is a zoonotic bacterial infection transmitted through contact with water, soil or surfaces contaminated with the urine of infected animals, particularly rodents. Severe infection is known as Weil’s disease, which can affect the liver, kidneys and other organs.
This test is commonly used in acute illness, especially when symptoms develop after environmental or occupational exposure.
Why do I need a Leptospirosis IgM test?
Leptospirosis can range from mild flu-like illness to severe, life-threatening disease. Early detection allows prompt antibiotic treatment and reduces complications.
You may need this test if you:
- Have fever, chills and muscle pain
- Experience jaundice or dark urine
- Have headache and eye redness
- Have kidney or liver abnormalities
- Were exposed to floodwater or contaminated freshwater
- Work with animals or in agriculture
- Have unexplained febrile illness after travel
Symptoms commonly associated with leptospirosis include:
- Sudden high fever
- Severe muscle pain (especially calves)
- Headache
- Red or irritated eyes
- Nausea and vomiting
- Jaundice (Weil’s disease)
Benefits of the Leptospirosis IgM test
- Detects recent infection
IgM antibodies indicate acute disease. - Supports early diagnosis
Enables timely antibiotic treatment. - Relevant for Weil’s disease assessment
Identifies severe leptospirosis risk. - Clinically recognised infectious marker
Used in tropical and infectious medicine. - Useful after environmental exposure
Especially following floods or freshwater contact. - Simple blood test
No invasive sampling required. - Guides further confirmatory testing
Indicates need for PCR or paired serology. - Supports public health investigations
Relevant in outbreak or exposure settings.
Step by step – how the test works
You can access Leptospirosis IgM testing UK-wide through two options:
- Clinic appointment
Attend your nearest UK clinic where a healthcare professional will take your blood sample. - At-home or hotel visit (£60 extra)
A qualified phlebotomist comes to your home or hotel for sample collection.
Your sample is analysed in an accredited UK laboratory, and results are delivered securely.
Your results explained
Negative Leptospira IgM
No evidence of recent leptospirosis infection.
Typical UK interpretation:
- Leptospira IgM: Negative
Positive Leptospira IgM
Suggests recent or active leptospirosis infection. Clinical follow-up is required.
Typical UK interpretation:
- Leptospira IgM: Positive
Borderline or early infection
Repeat testing or confirmatory PCR may be recommended if symptoms persist.
Results must be interpreted alongside symptoms and exposure history.
How It Works
Simple steps to get your results
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Visit or Test at Home
Attend one of our UK or London clinics, arrange a home nurse visit, or use a finger-prick kit where available.
Get Your Results
Your sample is analysed by accredited UK laboratories, with secure results delivered directly to you.
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WhatsApp UsHow to Prepare for Your Test
Follow these guidelines for accurate results
Sample Timing
Where possible, attend your blood test between 7am and 12pm. Please wait until any short-term illness or infection has fully resolved before testing. Avoid intense exercise for 24–48 hours beforehand, as this can affect certain markers.
Fasting & Hydration
Fasting is not always required, but some tests may recommend it. If fasting is advised, avoid food for 8–12 hours before your appointment and drink water only. Stay well hydrated, as this helps with sample collection and accuracy.
Medications & Supplements
Continue prescribed medications unless advised otherwise by your clinician. Avoid vitamin, mineral, or biotin supplements for at least 24–48 hours before your test, as these can interfere with results. If you are unsure about any medication or supplement, please let us know before your appointment.
Hormones & Menstrual Cycle
For hormone-related tests, timing within your menstrual cycle may be important. If relevant, follow any specific guidance provided on your test page.
If you have any questions or special circumstances, our team is happy to advise before your appointment.