Activated protein C resistance, factor V Leiden and assessment of thrombotic risk.

Venous thromboembolism comprises deep vein thrombosis (DVT) and pulmonary embolism (PE). Acute venous thromboembolism (VTE) is a serious and potentially fatal disorder which often complicates the course of hospitalized patients, but also affects ambulatory and otherwise healthy people. The annual incidence of venous thromboembolism is 1 to 2 cases per 1000 person and the risk of the disorder rises exponentially with age, from an annual rate of less than 5 per 100,000 children to greater than 400 per 100,000 adults older than 80 years.