CMV tests are used to help diagnose a current, reactivated, or past CMV infection in

people at risk for health complications. Risk groups include: People with weakened

immune systems due to certain infections or diseases. People who have recently received an

organ transplant.Positive CMV IgM results indicate a recent infection (primary,

reactivation, or reinfection). IgM antibody responses in secondary (reactivation) CMV

infections have been demonstrated in some CMV mononucleosis patients, in a few pregnant

women, and in renal and cardiac transplant patients.