UPPER AND LOWER LIMB DOPPLER An imaging technique that uses ultra sound to examine the upper and lower limb is known as Upper and Lower Limb USG.Doppler Ultrasound is a scan used to check the movement of the blood vessels.Upper and Lower Limb doppler helps to study the blood flow in the lower and upper limb by using high frequency waves.Mainly used to examine the blood flow in arteries and veins of the legs and arms.It is a safe and painless test.It takes only about 20–30 minutes to perform the same.