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The Rubella Antibody (IgG) Immune Status test determines if you have immunity to Rubella, also known as German measles. Rubella infection during pregnancy can cause serious birth defects, making early immunity screening critical. This test measures the presence of IgG antibodies, which indicate past infection or successful vaccination. Knowing your Rubella immunity status helps guide prenatal care and protect fetal development. If immunity is low or absent, vaccination is recommended prior to pregnancy, not during. Testing for Rubella IgG is a standard part of early pregnancy and preconception screening.