What Technique Would You Use to Assess Deep Vein Thrombosis

What technique would you use to assess deep vein thrombosis (DVT) ?

A) Patient sits in a comfortable position and lifts knee to chest.
B) Patient points toes toward the floor and reports any pain in the thigh area.
C) Patient points toes upward (dorsiflex) for assessment of pain in the calf.
D) Patient holds foot in neutral position and you squeeze the calf.