Every time I have my urine tested it shows that I have a large number of red blood cells. I had a stroke six years ago and have subsequently been on Coumadin. Before I began taking Coumadin my urine was measured as having few red blood cells. I am wondering if Coumadin or other blood thinning agents are the cause of this increase?

Anti-coagulants such as Coumadin (warfarin) can cause red blood cells in the urine.  I suggest that if this persists, you should be evaluated by a urologist.  Persistent bleeding into the urine can be a sign of bladder problems and should be evaluated by a urologist.

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