Thromboembolism	Duration of anticoagulation	Strength of recommendation*	Reference
First event with a reversible or time-limited risk factor for venous thromboembolic disease (e.g., trauma, surgery)	At least 3 months	A	4
First episode of idiopathic venous thromboembolic disease	At least 6 months	A	4
Recurrent idiopathic venous thromboembolic disease or continuing risk factor (e.g., thrombophilia)	At least 12 months	B	4
Symptomatic isolated calf-vein thrombosis	6 to 12 weeks †	A	17