A Doppler is a form of ultrasound scan that helps to assess your baby’s health. It measures the blood flow in different parts of your baby’s body, such as his umbilical cord, brain and heart. This helps to show whether he’s getting all the oxygen and nutrients he needs via the placenta. Color Doppler uses a computer to convert the Doppler measurements into an array of colors. This color visualization is combined with a standard ultrasound picture of a blood vessel to show the speed and direction of blood flow through the vessel.
A Doppler scan can be performed at the same time as a normal ultrasound and uses the same equipment. Most ultrasounds have a Doppler function. The person carrying out the scan (sonographer) will put some gel on your tummy and move a hand-held device (transducer) over your skin.