s time, or get another sonographer to confirm the diagnosis with a vaginal
scan.
If no embryo can be seen, a missed
miscarriage can only be confirmed if the pregnancy sac is at least 25mm (1in). If an embryo can be seen, but does not appear to have a heartbeat, the embryo must measure at least 7mm (0.3in) for your sonographer to be sure.
In later pregnancy, missed miscarriages may be due to an infection such as parvovirus or rubella.