Hepatitis A (HAV) IgM Antibody

The Hepatitis A IgM (Immunoglobulin M) Antibody test is a crucial diagnostic tool used to identify an acute or recent infection with the Hepatitis A virus (HAV). When the body encounters this highly contagious liver virus—typically through contaminated food or water—the immune system responds by producing specific antibodies. IgM is the first type of antibody to appear. The presence of IgM antibodies typically indicates that the infection is active or occurred within the last six months. These levels usually peak within the first few weeks of symptoms (such as jaundice, fatigue, and abdominal pain) and gradually decline as the body clears the virus.