Clinical suspicion of<unk> : edema, tenderness over the calf, Homan's sign
Clinical suspicion of PE: chest pain, shortness of breath, tachycardia, tachypnea
DVT ultrasound
Ankle-brachial index
Thromboelastography 
IVC ultrasound
D-dimer
Aortic ultrasound
Bubble study
Age adjusted D-dimer