Hi mama! Rubella IgG test ay para malaman kung mayroon ka nang immunity against rubella, either dahil na-vaccinate ka na before or na-expose ka na sa virus, kaya protected ka na. Ito usually ginagawa during pregnancy check-ups o pre-conception screening para ma-confirm na safe ka at ang baby mo, since rubella during pregnancy can cause serious complications, kaya importante talaga alam ng OB mo ang status mo!