Why must I have blood tests while taking Warfarin?

You will require to have regular blood tests while taking Warfarin to monitor your INR.  This is necessary so that the time it takes for your blood to clot can be kept within the Therapeutic range that your doctor has established is right for you.

Keeping your INR within its desired range is vital because,

If your INR is below your Therapeutic Range you will be at risk of blood clots forming.

If your INR is above your Therapeutic Range you will be at an increased risk of bleeding.

This is why it is important to have INR tests done regularly to ensure that the amount of Warfarin you are taking is correct.