This is the definitive test for an active Leptospirosis infection. This 'monsoon fever' is a bacterial infection often contracted from contaminated water. This test is essential as it specifically looks for the "first-responder" (IgM) antibodies, which your body only produces during a current or very recent infection. A simple blood draw is required. This test is critical for a fast, accurate diagnosis. It provides the clear, 'real-time' answer your doctor needs to get you on the correct antibiotic immediately. (For a complete picture of your immune status, we also offer the comprehensive IgG/IgM Panel).