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INR Test

To help ensure a safe treatment process while taking a blood-thinning medication, it is important to occasionally test that your medication is working effectively. The international normalized ratio (INR) test is performed to calculate how long it takes the blood to clot.
Testing the INR value can help healthcare providers determine if your blood-thinning medication is at an effective and safe dosage. If your INR is too high, your blood may have problems clotting and you could have a risk for uncontrollable bleeding. However, if your INR is too low, you may have an increased risk for a blood clot or stroke.
The INR value is checked frequently (two to three times per week) when a person first starts a blood-thinning medicine. Once a person is stabilized on the medicine, INR tests are generally less frequent (ideally once or twice per month).
(For more information on this test, click INR. This Web resource offers a closer look at why this test is important, specific values that are considered a normal range, and factors that may affect your results.)
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