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An International Normalized Ratio of 2.0 to 3.0 is the acceptable range for most people taking warfarin according to Mayo Clinic. However, the desired INR target range may be slightly lower or higher for certain individuals. An INR represents how long it takes for a person's blood to clot. Patients with a higher INR can be at risk of bleeding as it takes longer for their blood to clot, while patients with a lower INR can be at risk of developing blood clots. There are many factors that can affect how warfarin works, and the INR test helps in finding the appropriate warfarin dose for each person, according to NPS MedicineWise.
PT/PTT are laboratory tests that measure the clotting time (how long it takes blood to clot.). PT/PTT are blood tests and INR is a ratio calculated from the PT. At least a dozen blood proteins, or blood clotting factors, are needed to clot blood and stop bleeding (coagulation).Prothrombin, or factor II, is one of several clotting factors produced by the liver.OW PT/PTT = risk for blood clots/ stroke. The INR stands for International Normalized Ratio. The INR is calculated from the PT and is intended to allow valid comparisons of results regardless of the type of PT reagent used among different laboratories (INR = [patient PT / mean normal PT]).