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Does Warfarin effect both my IandR and PT & what does these stands for ?

I have had A-FIB for at least 30 years. I am now 72 years of age. I am on the drug Warfarin and up until about a month ago my blood count numbers were ok as per my Dr. My IandR is now 1.8 and my PT is 17.7 Where should my numbers be ? Does Warfarin effect both my IandR and PT ? What does IandR and PT stand for ?
Asked On : Thu, 17 Dec 2009
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Warfarin is given orally to prevent thrombus formation in Atrial Fibrillation patients. PT (Prothrombin Time) and INR (International Normalized Ratio) - INR is derived from PT - are monitored to maintain the optimal drug effect. For A-Fib INR is recommended to be kept between 2 and 3. Your INR is now just under 2.
Answered: Thu, 17 Dec 2009
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