Coagulation Self-Testing - FAQ

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1. What are the advantages of INR self-monitoring?

INR Self-Monitoring:

  • Allows you to be more involved in your treatment, giving you the confidence and the reassurance to maintain control of your anti-coagulation therapy
  • Allows you to test more frequently, which can enable you to spend longer in your therapeutic range, and potentially reduce the risk of complications such as clots or bleedings.
  • Makes it much easier to adapt your therapy more closely to make it just right for YOU
  • Involves no invasive blood sampling: only a drop of blood from the fingertip is required
  • Gives you freedom to enjoy a more independent life – at home, at work – anywhere!
  • Reduces trips to the lab or clinic for testing
2. How often should I test?

The interval between tests will be recommended to you by your doctor or nurse.

3. What is INR (International Normalised Ratio)?

The World Health Organisation recommends using INR as a way to measure and report the results of blood coagulation tests. The International Normalized ratio (INR) was developed by the United Nations and is the globally accepted measurement of the time it takes for your blood to clot.

4. What does an INR value of 1 or 2 mean?

A person who does not take any anticoagulants (oral anticoagulants) typically has an INR value of 1. A measured INR value of 2 means that blood coagulation takes twice as long. Consequently, with an INR of 3, coagulation takes three times as long.

This means that the higher the INR value, i.e. prolonged coagulation time, the more coagulation is inhibited.

5. What does therapeutic range interval mean?

You will be given a therapeutic range by your doctor according to the condition for which you are taking anticoagulants. Within that range you will have a target INR.

The target INR within the therapeutic range is where you will be at the lowest risk for a complication.

For example if your therapeutic range was 2 to 3 then your target INR would be 2.5. It is important to keep within your therapeutic range.