Doppler ultrasound uses sound waves to detect the movement of blood in vessels. It is used in pregnancy to study blood circulation in the baby, uterus and placenta. Using it in high-risk pregnancies, where there is concern about baby's condition, shows benefits.

Why is Doppler scan done?

A Doppler ultrasound may help diagnose many conditions, including: Blood clots. Poorly functioning valves in your leg veins, which can cause blood or other fluids to pool in your legs (venous insufficiency) Heart valve defects and congenital heart disease.

Why is Doppler used in pregnancy?

A Doppler flow study may be used during pregnancy to check the health of the unborn baby (fetus). It checks blood flow in: The umbilical vein and arteries. The baby's brain.