Leptospira antibody test
Quick answer: This blood test measures antibodies against Leptospira, bacteria spread through water or soil contaminated by animal urine. Doctors order it when you have fever, muscle pain, red eyes or jaundice, especially after wading through flood water.
- SampleBlood
- TakesAbout 5 minutes
- Before the testNo special preparation is usually needed.
How the test is done
- 1A nurse notes any recent flood water or animal contact
- 2A vein near your elbow is cleaned
- 3A needle draws a tube of blood
- 4The lab tests for Leptospira IgM antibodies
What your results can mean
Reading your report
A positive IgM usually suggests a recent or current infection and a positive IgG a past infection or immunity, but your doctor will read the result alongside your symptoms.
If the result is outside the usual range
A positive IgM can point to leptospirosis, which can cause fever, muscle pain and, in severe cases, jaundice and kidney problems. It may be negative in the first few days, so a repeat test may be needed.
Who usually has this test
People with fever, calf muscle pain, red eyes or jaundice after wading through flood water or working in fields or drains.
Risks and aftercare
Nothing special for the blood draw; severe symptoms such as reduced urine need urgent care.
Names and options
Also called: leptospirosis test, lepto IgM, lepto IgG, rat fever test
Options
- IgG
- IgM
Listed by the hospital as
- LEPTOSPIRA IGG ANTIBODY, SERUM
- LEPTOSPIRA IGM ANTIBODY, SERUM
Questions about this test
How common is leptospirosis after floods?
Cases often rise after heavy rains and flooding, as water mixes with rat urine. Covering cuts and wearing boots in flood water lowers the risk.
Why might the leptospira test be repeated?
IgM antibodies usually appear after about 5 to 7 days of illness. If tested early, the result may be negative even if you have it.
Is leptospirosis treatable?
Yes. Antibiotics work well, especially when started early. Severe cases may need hospital care.
Related tests
Tamara Hospital & IVF Centre, Rajajinagar
34/3, 10th Cross Road, opp. Vardhaka Sardar Patel School, 1st N Block, 2nd Stage, Rajajinagar, Bengaluru 560010
The hospital is open 24 hours. Call before you come to check the timing for your scan or sample collection.
Get directions ↗IVF Pulse fertility care at Tamara Hospital →
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This page explains each test in general terms so you know what to expect. It is not medical advice: your doctor decides which tests you need and what your results mean. Reference ranges differ between laboratories. Updated 4 November 2026.