Hi Srikanth garu, a positive rubella IgG test in pregnancy is 1.0 or higher. That means you have rubella antibodies in your blood and are immune to future infection. This is the most common rubella test done. Rubella is caused by a virus that’s passed from person to person. It can spread when an infected person coughs or sneezes. It can also spread by direct contact with an infected person’s respiratory secretions, such as mucus. It can also be passed on from pregnant women to their unborn children via the bloodstream. The infection of rubella in pregnancy is worrisome due to the fact that it causes miscarriages, congenital defects etc. Most people who have rubella recover completely without permanent side effects and are immune to rubella afterward. This is not the case for a fetus infected in the womb. Fetal infection can cause serious long-term effects. Please consult your Gynaecologist once. They will explain to you everything clearly.