I have had microscopic blood in my urine for over 10 years. In the last 5 years I started having increasing protein in my urine as well. I had several bouts with kidney stones as well. I now take a pill to reduce the pressure in my kidneys, which slows down the protein that passes in my urine. I have always felt it is related to the A.S., but doctors won’t really say for sure, because they really don’t know.