released from hospital after 1 week of heprin drip and conversion to coumadin. Had alms died from multiple bilateral PEs. went home on coumadin right at 2.0 - three days later developed a new clot on coumadin (a very big clot in left leg). Admitted again and converted to lovenox injections. Minimum of 4-6 months. They are calling it coumadin failure but hematologist is dumbfounded as to how I developed clot in leg while on coumadin (finger prick morning of leg clot was 1.9 but had been as high as 2.2 in past few days) I scared now because dr cant explain.