Deep Vein Thrombosis (DVT) is a serious but usually treatable medical condition. DVT occurs when a blood clot forms within a deep vein in a leg, thigh or even the arm. If part of the clot breaks off and travels to the lung, it can cause a potentially life-threatening condition known as pulmonary embolism (PE) which is the most serious complication of DVT. It is essential that patients with DVT or PE are quickly diagnosed then treated to prevent clot growth and future clot formation.