pt time intended prothrombin anticoagulant anticoagulants inr normalized range ptt 
aptt intended anticoagulant ptt activated anticoagulants thromboplastin range pt partial 
inr range normalized ratio international coumadin therapeutic anticoagulant normal enroll 
inr desired anticoagulation anticoagulant recommended range level stable receiving normalized 
pt time anticoagulant intended anticoagulants prothrombin ptt inr range normalized