A duplex ultrasound is a non-invasive method of detecting and quantifying the narrowing and blockage within the blood vessels. It's carried out by a properly trained sonographer and is confirmed by a Radiologist. It's really a painless method carried out with a sofa and usually can take 1-two several hours. https://sgvasculargrp.com/medical-condition/peripheral-arterial-disease/icon-peripheral-arterial-disease-pad-2-3/