This examination is offered in order to ascertain the pregnancy viability but also if the pregnancy is growing in the right location. It will also confirm the presence of one or more fetuses. In case of multiple pregnancy it will be possible to determine if the fetuses are possibly sharing blood from the same placental circulation. If found to be the case, it has great significance for the progress of pregnancy.
Between 7-11 weeks it is also possible to assess more accurately the age of the pregnancy. The length of the fetus at this stage correlates with excellent accuracy to the pregnancy gestation, irrespective if finally the baby results in a small or large birth weight. However this high level of accuracy is lost as the pregnancy advances thereafter fetuses grow at different rates based mainly on their genetic potentials.