Urinating blood is never a good thing. We worry about trauma, infections, stones & cancer among other causes. In someone taking Coumadin (warfarin), we can check PT/INR regularly to determine whether s/he is taking the right amount, too much or too little. Depending upon the reason for Coumadin (INR 2-3 if atrial fibrillation or blood clots, INR 2.5-3.5 if mechanical heart valve), the goal INR changes. Bleeding while on Coumadin suggests too much Coumadin. As just noted, a simple blood test can determine by how much. The solution is to stop the Coumadin for a few days, then restart at a lower dose. Sometimes, especially when associated w/bleeding, we also offer vitamin K. Hope this helps. Good luck!
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