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INR Management

finger prick to test for blood sugar

What Is an INR Test

An INR test measures the time for the blood to clot. It is also known as prothrombin time, or PT. It is used to monitor blood-thinning medicines, which are also known as anticoagulants. The INR, or international normalized ratio, can also be used to check if you have a blood clotting problem. Prothrombin is a protein produced by the liver. It is one of several proteins, known as clotting factors, that help the blood stay at the right consistency. The INR test measures this clotting factor by measuring how long it takes for the blood to clot.

Why Do I Need to Test?

  • Blood-thinning medicines such as warfarin are used to prevent blood clots. Warfarin is usually prescribed for people who have atrial fibrillation (where the heart beats unevenly) or who have had artificial valves fitted. How well warfarin is working is measured by how it increases the blood clotting time. So, if you are taking warfarin, you might need an INR test.
  • Blood thinning medicines work by increasing the time it takes for the blood to clot.
  • Your doctor can use an INR test to make sure the warfarin dose is right for you.
  • Blood clotting helps the body stop bleeding. But blood clots can also cause strokes or heart attacks. The INR test helps balance the risk of internal bleeding against the risk of blood clotting.
INR OlderWhiteWoman Kitchen CoagSense

Increasing Evidence for INR-Self Monitoring

Patients on long-term anticoagulation therapy are less likely to experience a thromboembolic event, according to researchers at Oxford University.  

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