Test Details: The Rubella IgG antibodies test helps to determine if sufficient rubella antibodies are present enough to protect from the rubella virus. It also helps to verify previous or recent rubella infection. The Rubella IgG antibodies test is done: As a part of the immunity panel. Prior to or during pregnancy to verify immunity. In case of signs and symptoms of rubella in a pregnant woman. In case of signs of abnormal development or birth defects in new-born.