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HealthInfo Canterbury

Warfarin monitoring

If you are taking warfarin, it is important that you have regular blood tests to get your dose of warfarin correct. If your dose is too high, you may have bleeding problems. If it is too low, it may not have the desired effect.

The blood test checks how long it takes your blood to clot and is called an INR test.

Your GP will tell you how often you need to have an INR test, and after each test they will tell you if you need to change your warfarin dose. There are booklets and calendars available to help you record and remember your blood tests and doses of warfarin. If you don't already have one, ask your general practice or pharmacy to give you one.

Some community pharmacies can now provide INR monitoring using a finger-prick test. If you are interested in this service talk to your pharmacist and GP or practice nurse.

This interactive map will show you if there is a pharmacy in your area that offers the service.

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Written by HealthInfo clinical advisers. Updated March 2017.

See also:

Food choices and warfarin

Page reference: 67663

Review key: HIBCD-165829