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Prothrombin Time (PT)
This test indicates how fast your blood is clotting. The information
helps your health care provider establish the dose of Coumadin® (Warfarin
Sodium) you need. Protimes are often recorded as an INR (International
Normalized Ratio), a standardized way of measuring protimes.
When you start taking Coumadin®, you may have a protime test done
biweekly the first week, then perhaps one time every week. This will
help your healthcare provider give you the dosage of Coumadin® that is
right for you. Once your healthcare provider decides on that dosage,
you will probably need protime tests less often.
Sickness, diet, other medicines (prescriptions and over-the-counter),
or physical activities may affect your PT/INR. Tell your healthcare
provider about changes in your health, medicines you are taking, or
your lifestyle so he or she can adjust your dosage of Coumadin® (Warfarin
Sodium), if needed.
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