Blood in urine after 3 weeks of my kidney removal?

Need more info. Not enough info for a clear answer. Was a catheter used post op? Do you have symptoms of infection. Was there cancer of the kidney? Ureter? Bladder? Was it a partial kidney removal? You need to follow up with your urologist.
Hematuria. I've thought about your question and these are my thoughts: first, bloody urine after kidney surgery is not unusual, but it should have gone away or gotten less by now. Second, i would suggest you talk with your surgeon and share your concerns. It is possible that a blood vessel that was cut during the operation is still leaking and this needs to be addressed, .