Hello. Welcome to Ask The Doctor.
No a blood clot in leg won't cause blood in urine.
But yes treatment of blood clot on leg (Deep Vein thrombosis DVT) can cause blood in urine.
Since a person who has got DVT is always treated with Anti coagulation. So the drugs used for Anti Coagulation like Heparin and Warfarin can cause bleeding from any part of the body including blood in Urine.
I hope it helps.
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