The current diagnostic method for assessing the occurrence of a miscarriage may not be completely accurate, according to new research.
A study from Queen Mary, University of London concluded that more work must be conducted to ensure that ultrasound measurements are correct in calculating miscarriage cases.
Currently doctors use the equipment to look for the presence and heartbeat of an embryo in a woman's pregnancy sac.
The results are vital because if a miscarriage is confirmed the mother is offered medical treatment to speed up the process.
"When we're testing to see if someone has a healthy pregnancy or not, we want to be absolutely confident that the test is reliable to avoid making a misdiagnosis," said Dr Shakila Thangaratinam, senior clinical lecturer at Queen Mary, University of London.
The Miscarriage Association states the process is often misrepresented in films and on television and some pregnant women who experience a miscarriage will have no outward symptoms.