Cytomegalovirus testing is a blood test administered to determine recent or past CMV infection in case of hereditary ailments in the babies as well as morbidity in organ transplant recipients. IgM antibodies are produced when latent CMV will be activated again and are the foremost to be formed. IgG antibodies are produced weeks after the primary CMV infection. The individual who was once detected for positive CMV Antibodies infection is more likely to suffer from the recurrent contamination. Health practitioners advise the test to verify the immunity retort to antiviral therapy. The test is ordered in combination with the other tests.