This is an ultrasound examination that is usually carried out vaginally at 6-10 weeks of pregnancy.
The aims of this scan are to determine the number of embryos present and whether the pregnancy is progressing normally inside the uterus.
This scan is useful for women who are experiencing pain or bleeding in the pregnancy and those who have had previous miscarriages or ectopic pregnancies.
The figure on the left shows a normal pregnancy at 7 weeks of gestation. The figure on the right shows the empty sac of an anembryonic pregnancy at 7 weeks.