Radiology• Updated 21 October 2026
Doppler Ultrasound
An ultrasound that shows blood flow in arteries and veins, used for clots and narrowed arteries.
Results: Same day
Quick Summary
Primary Purpose
To check for DVT, narrowed leg or neck arteries, varicose veins and blood flow in pregnancy.
What It Measures
Speed and direction of blood flow.
Preparation
Usually no preparation.
Overview
Doppler is the main test for DVT.
Carotid Doppler checks the neck arteries for stroke risk.
What It Measures
Veins
Clots and valve leaks.
Arteries
Narrowing.
How It's Performed
- 01
Scan
Gel and probe over the area.
- 02
Pressure
The probe may press on the vein.
- 03
Afterwards
Return to normal.
Sources and further reading
Last updated 21 October 2026. For more detail, see these trusted health organisations.
- Doppler Ultrasound(opens in a new tab) · MedlinePlus, US National Library of Medicine