Rubeola, Rubella or measles as commonly known is diagnosed by getting a Rubella Antibody IgG test in which a blood sample is taken so the level of Rubella Antibodies - IgG can be checked in your blood. This test is done to confirm if the patient is affected by the virus and during the treatment and after as well to affirm the virus is completely out of the body. This test is also labeled as German Measles Avidity Test ELISA blood. Measles are proteins that get produced as virus-specific by the immunity system due to the response to vaccines. Rubeola has a mild illness in comparison to measles, but for pregnant women, it can be fatal as it can cause the new born to be born with harsh birth defects.