I don't believe my current team has ever told me directly. I understood peak and troughs to "be sure I'm at therapudic levels" but not necessarily that I could be at risk. It's good to know. I've been on tobra a lot and have diabetes, so this is something for me to remember - especially since some doctors have let their patients fall through the holes....we have to be on top of it. However, I do know sometimes they check my urine - so that may be part of them checking - dunno. I just assumed it had to do with my diabetes. Boy, it sure would be nice if the dr's explained they whys of things. I assume too much.