Recommended Therapeutic Range and Duration of Warfarin Therapy Diagnosis Target INR Duration Deep Vein Thrombosis (transient risk - 1st episode) range terapeutico 4.50 prendo coumadin dal 2003 ho 88 anni e non li dimostro mi sento bene, in seguito a quel 4.50 mi hanno trovato sangue occulto nelle feci nasce un dubbio sarà un tumore o la colpa è del cumadin ?? sono stitico e faccio sforzi per defecare. In patients undergoing minimally invasive procedures who must be anticoagulated prior to, during, or immediately following these procedures, adjusting the dosage of COUMADIN to maintain the INR at the low end of the therapeutic range may safely allow for continued anticoagulation. Here is a brief simplified chart of human blood INR Range, showing INR levels, and the factors that affect them. This chart illustrates typical therapeutic INR levels, while using Coumadin (warfarin) therapy. Normal INR Levels. The normal range for a healthy person not using warfarin is 0.8–1.2. However, this is a dangerously low INR for a person using Warfarin. The prothrombin time (PT) is a test used to help diagnose bleeding or clotting disorders. The international normalized ratio (INR) is a calculation based on results of a PT that is used to monitor treatment with the blood-thinning medication warfarin (Coumadin®). Prothrombin time (PT) is a blood test that measures the time it takes for the liquid portion (plasma) of your blood to clot. A related blood test is partial thromboplastin time (PTT). A prothrombin time test tells you how long it takes your blood to clot. Learn what it looks for, when you might need one, and what the results mean. For patients who are taking blood-thinning drugs, such as warfarin, the normal level of PT/INR or prothrombin time expressed in international normalized ratio ranges from 2.0 to 3.0, states Mayo Clinic. The prothrombin time (PT) – along with its derived measures of prothrombin ratio (PR) and international normalized ratio (INR) – are assays evaluating the extrinsic pathway and common pathway of coagulation.