what is inr levels
INR Levels. For people taking blood-thinning medications, it is important to make sure that the medication is working properly to avoid serious complications. To help ensure safe treatment, a healthcare provider will take a blood sample and test how long it takes the blood to clot.f your INR falls below the normal levels, your blood may clot too quickly and increase your risk for a stroke. (Click INR for more details on the specific levels of INR that are considered within a normal range, as well as information on how often this ratio needs to be checked.). Advertisement.