I have severe protein C . Diagnosed in Nov 94 . My PT has been like a pogo stick the last couple of months . The previous 3 of the last 4 inrs was too thinned out .Todays labrat work said I now am too low (2.18) . My INR is kept 3 to 4 and is closely monitored by an internal medicine specialist. just getting abit frusterated. Why is warfarin so hard to get leveled out at the right levels ?