Furthermore, a decline has been shown in the number visits to specialists. Nevertheless, it is unclear whether the number of children born with lower birth-weights than expected has declined because of routine ultrasound examination. Likewise, it has not been shown whether or not routine ultrasound examinations affect the load on hospital birthing units. A pregnancy involving twins is associated with a greater risk for complications than a pregnancy involving a single birth. Hence, theoretically, early diagnosis of twins should lead to better outcomes of pregnancy.
Ultrasound examination can determine the number of fetuses with relatively high certainty.
Several controlled studies show that routine ultrasound examination leads to earlier diagnosis of multiple pregnancies. However, there is no undisputed evidence to show better outcomes for twins whose mothers undergo routine ultrasound examination. The current monitoring and treatment methods are, however, probably superior to those used in the studies upon which this report is based. Diagnosis of Placenta Previa Placenta previa means that the placenta develops abnormally low in the uterus. This condition occurs in approximately two cases per 1000 deliveries in Sweden.