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 To optimize patient positioning, slightly abduct and externally rotate hip.

 Start by placing probe in transverse position along inguinal crease and locating common femoral vein (CFV).

 Compress vein firmly with transducer. If vein does not completely collapse despite applying enough pressure to deform the artery, a clot is likely present.

 Scan down medial thigh toward bifurcation of the CFV into the superficial and deep femoral veins. Compress every centimeter to systematically evaluate for clot.

 Lastly, place probe behind knee in popliteal fossa and locate popliteal vein which lies superficial to the artery. Compress vein firmly to assess for clot.