Duplex Ultrasound Scan

Note: the information below is a general guide only. The arrangements, and the way tests are performed, may vary between different hospitals. Always follow the instructions given by your doctor or local hospital.

What is duplex ultrasound?

Duplex ultrasound is a special ultrasound technique that can assess how fast blood is flowing through a blood vessel. The test combines traditional ultrasound with Doppler ultrasound. Regular ultrasound uses sound waves that bounce off different structures of the body to create pictures. Doppler ultrasound records sound waves reflecting off moving objects, such as blood, to measure their speed and other aspects of how they flow.

A duplex ultrasound scan is a quick, simple, painless, noninvasive test. It is a way of looking at arteries and veins, measuring their size and the flow of blood through them. Duplex ultrasound scans are usually done as outpatient tests.

What is ultrasound?

Ultrasound is a high-frequency sound that you cannot hear, but it can be emitted and detected by special machines.

How does duplex ultrasound work?

Ultrasound travels freely through fluid and soft tissues. However,