patient presents for a venous Doppler of the lower extremities to rule out DVT. She states that she has had right popliteal DVT 8 months ago. The report from the previous study describes thrombus in the popliteal vein and upper deep calf veins. Today's exam demonstrates non-occlusive thrombus in the popliteal vein and distal femoral vein. The segment in the femoral vein has a loose end that is floating freely in the venous lumen. What should you do next?