Deep vein thrombosis (DVT) is a blood clot that develops within a deep vein of the body, usually in the leg and ultrasound scans are commonly used to diagnose or exclude the existence of DVT.
DVT usually occurs in a deep leg vein, a larger vein that runs through the muscles of the calf and the thigh.
It can cause pain and swelling in the leg and may lead to complications such as pulmonary embolism.
This is a serious condition that occurs when a piece of blood clot breaks off into the bloodstream and blocks one of the blood vessels in the lungs (see below).
The DVT ultrasound scan is the first-line imaging technique to check the veins for any signs of a clot.