Rubella, commonly known as German measles, is a contagious viral infection characterized by a distinctive red rash, mild fever, and swollen lymph nodes. While often mild in children and adults, rubella poses significant risks during pregnancy, potentially leading to miscarriage or congenital rubella syndrome (CRS) in newborns. The Rubella Test measures the presence of specific antibodies Immunoglobulin G (IgG)—in the blood to assess immunity status.