A duplex ultrasound is a non-invasive method of detecting and quantifying the narrowing and blockage during the blood vessels. It is performed by a trained sonographer which is confirmed by a Radiologist. It is just a painless process carried out with a sofa and typically requires one-two hrs. Using tobacco: https://sgvasculargrp.com/medical-condition/peripheral-arterial-disease/icon-peripheral-arterial-disease-pad-2-3/