Rubella is a viral infection by the rubella virus. Rubella infection during pregnancy is associated with fetal malformations, bleeding, and other deleterious effects, so vaccination against this virus for women of childbearing age is suggested and the best time is the immediate postpartum period. The serum rubella antibody is measured and its result is interpreted as follows: ranges (in IU/mL): no immunity < 10.0 equivocal 10.0 - 14.9 immunity 15.0 - 200.0 high immunity > 200.0