Leptospira IgG Antibody, Serum (Quantitative)

What This Test Measures

Leptospira IgG antibodies are produced by your immune system in response to infection. This test quantifies their presence in your serum to assess exposure history. A positive result suggests prior infection or ongoing immune response, but it does not confirm active disease without additional clinical correlation.

Why It’s Ordered

Your healthcare provider may order this test if you’ve had symptoms like fever, muscle aches, or jaundice after potential exposure to contaminated water (e.g., hiking, farming, or travel to endemic regions). It’s also used in outbreaks or for individuals with unexplained lab abnormalities.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample drawn from your arm. Wear a loose shirt for comfort. Avoid alcohol for 24 hours before testing if possible, as it may affect certain lab results indirectly.

What the Results Mean

Results are reported as antibody levels (e.g., IU/mL). A low or absent result suggests no prior exposure. Elevated levels indicate past infection, but they may remain detectable for years. Active infection requires additional diagnostic tests (e.g., culture or PCR) and clinical evaluation.