The Cytomegalovirus (CMV) IgM Antibody test is used to detect the presence of IgM antibodies in the blood that develop in response to a CMV infection. CMV is a common virus that can infect people of all ages, and it is transmitted through contact with infected bodily fluids. The IgM antibodies are produced by the body’s immune system in the initial stages of a CMV infection, and they indicate an active or recent infection. This test is usually ordered when a person shows symptoms of a CMV infection, such as fever, fatigue, sore throat, and swollen glands. It is also used to diagnose congenital CMV infection in newborns, as the virus can be transmitted from a pregnant woman to her fetus. A positive IgM test result indicates an active or recent CMV infection, while a negative result indicates that there is no current or recent infection. However, further testing may be required to confirm the diagnosis.