An Ultrasound Scan or Sonography is a medical test that uses high- frequency sound waves to capture live images from inside of your body. In case of thighs, this test is named as Doppler Ultrasound which shows signs of decreased blood flow in arteries or veins of legs. This test uses high-frequency sound waves to measure the amount of blood flow through your arteries and veins. This test helps to diagnose and treat a variety of conditions including Blood clots and poor circulation. It is a safe as well as pain-free procedure. That’s it is also implemented in Pregnancy.