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Yes, your friend is correct. If all the evaluation for the microscopic hematuria turns of negative including the CT scan and cystoscopy, then you need to be evaluated by an affront to just to make sure there is no medical renal disease as the cause of your microscopically hematuria. There are conditions such as nephritis or nephrotic syndrome that can cause microscopic blood in the urine. Hope this helps and let me know if you have questions.
Yes. About 30% of the time, we can never find the cause of the microscopic bleeding.