You are working a busy ED shift at your hospital, when a 68-year-old female presents with a two-day history of a swollen and sore left calf. The patient has no venous thromboembolic risk factors or trauma history. Your physical examination reveals a well-appearing, afebrile patient with a normal neurovascular exam and no associated cellulitis. Confronted with a differential diagnosis of DVT, phlegmasia cerulea dolens, ruptured Baker’s cyst or occult soft tissue injury, how do you proceed?