A duplex ultrasound is a non-invasive approach to detecting and quantifying the narrowing and blockage during the blood vessels. It is actually done by a experienced sonographer and is also confirmed by a Radiologist. It's really a pain-free procedure carried out on the couch and usually normally takes 1-two hrs. https://sgvasculargrp.com/medical-condition/peripheral-arterial-disease/icon-peripheral-arterial-disease-pad-2-3/