Color Doppler is a technique in which colors superimposed on an image of a blood vessel indicate the speed and direction of blood flow in the vessel.The sound waves echo off of your blood vessels and send the information to a computer to be processed and recorded. The computer will produce graphs or pictures that show the flow of the blood through your arteries and veins.

At Sangi Hospital, this test can reveal blood clots in leg veins that could break loose and block blood flow to the lungs . During pregnancy, Doppler ultrasound used to look at blood flow in an unborn baby to check the health of the foetus..