Warfarin and Coumadin need to visit the lab to check the INR levels. In healthy people, INR 1.1 is the normal INR level. An INR range of 2.0 to 3.0 is generally an effective therapeutic range for people taking Warfarin for disorders such as atrial fibrillation or a blood clot in the leg or lung.With the help of the pt INR machine a patient just needs to do an INR test at home. They don’t need to visit the lab. Patients get the pt INR results simultaneously and they can keep the regular track of if they are in INR normal range. This machine is very effective and useful. Order one for yourself now. You don’t need to pay anything, it gets covered by your insurance companies. Website: