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Desirable Ranges of INR

The international normalized ratio (INR) blood test helps healthcare providers ensure that your dosage of a blood-thinning medication is safe and effective. The INR value is established by measuring the time it takes the blood to clot and then comparing it to an average.
A healthy person who is not taking a blood-thinning medicine will typically have an INR of about 1 (the ideal range is from 0.8 to 1.2). However, people taking oral blood-thinning medicines, like warfarin (Coumadin®, Jantoven®), generally have a higher INR value. As the dose is increased, a person's INR should also increase.
It is important that the INR falls within a desirable range. If it is too high or too low, it could cause blood clots or uncontrollable bleeding. The desired ranges are based on a person's reason for taking the medication and include:
  • 2 to 3 -- the typical range for most "blood-thinning" needs
  • 2.5 to 3 -- the desired range for people who have a high risk of developing a blood clot.
(Click INR for more details on the desirable ranges of INR, as well as information on how often this test is performed.)
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