Pulmonary embolus: 2 - 3
Deep vein thrombosis: 2 - 3
Atrial fibrillation: 2 - 3
Mechanical valve: 2 - 3.5, with higher end depending on valve location, valve type and hypercoagulable risk factors.
Source
Valentine, K. and Hull, R. "Anticoagulation in acute pulmonary embolism" Up to Date. 17 Oct 2008.
Manning, W. and Arnsdorf, M. "Anticoagulation prior to and after restoration of sinus rhythm in atrial fibrillation." Up to Date. 10 Oct 2008.
Landaw, S. and Bauer, K. "Approach to the diagnosis and therapy of deep vein thrombosis" Up to date. 17 Oct 2008.
Aurigemma, G. and Gaash, W. "Antithrombotic therapy in patients with prosthetic heart valves" Up to Date. 12 Oct 2008.