What Is a Duplex Ultrasound?

With Dr Andrew Choong, vascular and endovascular surgeon in Singapore

Published 10 September 2026 · 1 min 30 sec · Watch on YouTube

About this video

Dr Andrew Choong explains how ultrasound images show blood vessel structure while Doppler assesses blood flow. Duplex combines both, helping investigate narrowed arteries, venous reflux and possible blood clots.

Original video: What Is a Duplex Ultrasound? Vascular Surgeon Explains

Read the accompanying article for the written explanation and further context.

Related patient information

• Vascular duplex ultrasound
• Varicose veins and venous reflux
• Peripheral arterial disease
• Deep vein thrombosis (DVT)