Curvilinear/large convex probe (phased array probe may substitute)
Start at the superior aspect of the abdomen below the xyphoid process
Visualize aorta on the patient’s left, IVC on the right, and vertebral shadow posteriorly
Aortic ultrasound
Cardiac ultrasound
Age adjusted D-dimer
Bubble study
NEXUS Chest CT Rule
IVC ultrasound
ECG 
D-dimer