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Douglas Severance, Family Medicine, answeredInternational Normalized Ratio (INR) is the blood test used to monitor the thinness or thickness of your blood. If you take warfarin, your doctor will monitor your INR level at least once a month to make sure you have the proper amount of blood thinner in the body. If INR levels are too low, you are not being protected from blood clots. When the levels are too high, you are protected from blood clots but you are at risk of bleeding. Talk to your doctor about ways to help manage the proper amount of warfarin you are taking.