Rubella IgG Test is a laboratory test used to measure the level of IgG antibodies against the Rubella virus in the blood. The presence of these antibodies indicates that the person has either been vaccinated against the virus or previously exposed to it, which means they have immunity. This test is commonly performed for pregnant women, as it helps assess immunity levels against rubella, which is crucial for protecting the health of the fetus. Rubella infection during pregnancy can lead to serious complications. The test can also be used to determine the need for vaccination before pregnancy or in other situations where there is a risk of exposure to the virus. This test is considered a vital part of preventive healthcare.