Hepatitis A Virus Immunoglobulin M Antibody (IgM) – Serum

This test measures whether your body shows signs of a specific infection or condition by detecting certain markers in the sample your healthcare provider collects. The results help your care team confirm or rule out a diagnosis so they can recommend the most appropriate treatment plan for your situation.

This test measures **IgM antibodies** specific to Hepatitis A virus. IgM is the first type of antibody your body produces when it encounters a new infection. If your body is actively fighting Hepatitis A, these antibodies may be present in your blood.

Your healthcare provider may order this test if you have symptoms that suggest an infection, if you have been in close contact with someone who is sick, or as part of routine screening. It can also be used to check how well a treatment is working or to confirm that an infection has cleared after therapy.

You may need this test if you have symptoms like fever, fatigue, nausea, or jaundice (yellowing of skin/eyes) that could suggest a viral liver infection. It’s also used to diagnose Hepatitis A in people who recently traveled to or lived in areas with higher risk.

The test is usually done with a quick swab of the affected area, such as the back of the throat or inside the nose, though some versions use a small blood or urine sample. The collection takes only a few minutes, causes little discomfort, and the sample is then analyzed in a laboratory or on-site.

A blood sample is drawn from a vein in your arm. The sample is sent to a lab where it’s tested for IgM antibodies using an immunoassay method. Results are typically available within 1–3 business days.

Results are typically reported as positive, negative, or occasionally inconclusive. A positive result means the marker the test looks for was detected, a negative result means it was not found, and an inconclusive result means a new sample may be needed. Your provider will explain what your specific result means for your symptoms.

A positive result means your body is actively producing IgM antibodies to Hepatitis A, indicating recent infection. A negative result suggests no recent infection or insufficient antibody presence. False negatives can occur if tested too early after exposure.