The Hepatitis E Virus (HEV) IgM test is a laboratory test used to detect the presence of IgM antibodies against the HEV virus in a patient’s blood sample. The test works by detecting the body’s immune response to HEV, which is indicated by the presence of IgM antibodies specific to the virus. HEV is a viral infection that can cause acute or chronic hepatitis, and is transmitted through contaminated food or water. The HEV IgM test is typically used to diagnose acute HEV infections, as IgM antibodies are produced in response to a recent infection and can be detected in the blood within a few days to a few weeks after onset of symptoms. A positive result from the HEV IgM test indicates that the person has a current or recent HEV infection. However, it is important to note that false positive results can occur with this test, and additional testing may be required to confirm the diagnosis. Overall, the HEV IgM test is a valuable tool in the diagnosis and management of HEV infections, and can help guide treatment decisions and prevent the spread of the virus to others.