Microscopic evidence of blood in urine, passed a kidney stone 3 weeks, am a nonsmoker. What could it mean? What tests would be done?

Causes of hematuria. Hematuria can be caused by any bleeding in the urinary tract. It could be caused by a tumor of the kidney, kidney stones in the ureters or by a bladder tumor, among other things. Have your urine cultured and if you have hematuria with no uti, see a urologist for evaluation . If you do have a uti, have your urine analyzed after the infection to make sure it resolves. If not, see a urologist.