I see you wrote this quite awhile ago. I am new to this website. I saw your post about blood in your urine. You may have an answer by now. But, I wanted to let you know, I also have microscopic amounts of blood in my urine every time I do a urine collection. I have been told it is because I have medullary sponge kidneys. That was diagnosed years ago, after wondering why I have this, as well as repeated UTI's. About 20 years later I started passing kidney stones, and realize I have several in my kidneys. The one I am most concerned about it 9 mm in my left kidney. I was just wondering if you have been tested for medullary sponge kidneys??