![]() A normal INR value is between 0.8 and 1.1. The INR gives information about how quickly your blood clots when compared to blood that clots normally. International normalized ratio (INR): This number is calculated from your PT. If you’re taking warfarin (Coumadin) or other medications that affects how your blood clots, your PT will be longer than 13.5 seconds. A normal PT value is between 11 and 13.5 seconds. Prothrombin time (PT): Thismeasures how many seconds it takes for your blood to clot. These two values measure how quickly your blood clots: What is a PT/INR test?Ī PT/INR test is a blood test. We’ll explain why this happens, what to do if it happens to you, and ways to prevent it. And this can put you at risk for dangerous bleeding. But that number often rises over the target range - even without any changes to your dosage. For most people who take warfarin, the target INR is between 2 and 3, or 2.5 to 3.5, depending on the indication. People who take warfarin have higher INR levels because the medication slows the time it takes blood to clot. A “normal” INR is between 0.8 and 1.1 if you’re not taking any medications that prevent your blood from clotting (sometimes called “blood thinners”). The higher the INR number, the longer it takes the blood to clot (or the “thinner” the blood). This test indicates how long it takes your blood to clot. ![]() And if you’re one of these people, you know that you need to get frequent blood tests to check your international normalized ratio (INR).
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