[Deep vein thrombosis - diagnostics and clarification].

Deep vein thrombosis usually manifests as leg or pelvic vein thrombosis (DVT). The causes are either acquired or inherited and can also occur in combination. Early diagnosis and treatment of DVT can reduce the risk of pulmonary embolism and postthrombotic syndrome. The estimation of the clinical probability, if necessary in combination with the D-dimer test, points the way to further imaging diagnostics. After diagnosis, risk factors that led to the occurrence of thrombosis can be identified in many cases. In more than half of the cases, genetic causes play a role. If the cause is not clear, tumor screening should be performed, since up to 20 % of thromboses are due to tumor disease.