A duplex ultrasound is a non-invasive approach to detecting and quantifying the narrowing and blockage while in the blood vessels. It is performed by a qualified sonographer which is confirmed by a Radiologist. It is a painless course of action done with a sofa and usually will take 1-two hrs. https://sgvasculargrp.com/medical-condition/peripheral-arterial-disease/icon-peripheral-arterial-disease-pad-2-3/