This is a relatively new test that:

- is perfectly safe

- uses no needles or drugs

- doesn't use x-rays or any harmful radiation

- is done as an out-patient 

Some gel is put on the skin and the ultrasound probe is then placed on this. The vascular technologist who performs the scan can then see both the veins themselves AND the blood flowing within them. The Duplex cannot show the valves themselves, but by seeing how the blood flows, you can tell if they are working or not.

Use the menu above on the left to see what this looks like.