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Why does my mother have to have so many blood tests while taking warfarin?

Your mother needs regular blood tests to check to see how fast her blood clots while she is taking warfarin, and see if her dose of warfarin needs to be adjusted. These blood tests are called protime (PT) tests or International Normalized Ratio (INR) tests, or PT/INR for short. Her doctor and other healthcare providers will decide what range of PT/INR numbers are best for her. Her dose of warfarin will be adjusted from time to time to keep her PT/INR within that range.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.