Leptospira - IgM (Elisa) test is a diagnostic test for detecting infection with bacteria of leptospira species. This test detects IgM-class antibodies to leptospira species. The doctor advises the Leptospira - IgM test process if you are at risk or have symptoms of leptospirosis. The signs and symptoms of leptospirosis are similar to many other viral or bacterial infections, hence, a definitive test is essential. The symptoms may range from a mild flu-like illness to severe liver and kidney involvement.