HAV IgM refers to Immunoglobulin M antibodies specific to the Hepatitis A Virus. These antibodies are produced by the immune system in response to an acute or recent HAV infection.

HAV IgM testing is done to diagnose acute or recent Hepatitis A infections. It helps healthcare providers confirm an active infection, especially in patients with symptoms like jaundice, fatigue, and abdominal pain.

HAV IgM testing typically involves a blood sample. A healthcare professional will draw a blood sample from a vein, and the serum is then tested for the presence of HAV IgM antibodies.

HAV IgM testing is typically done when an individual is suspected of having a recent HAV infection. It's most accurate during the acute phase of the illness, which is usually within the first two weeks of symptoms

A positive HAV-IgM test result indicates a recent or ongoing Hepatitis A infection. It means the person has been exposed to the virus and is likely contagious.