I've had several blood tests this year, all showing an eGFR between 51 and 58, and my GP has just shown me they have tracked it down from the mid 70s a few years ago. He doesn't seem at all concerned, but may be trying to stop me worrying, as I'm naturally anxious. I'm going for a scan next week, but I don't think I've had my urine tested at all. Should I ask for that? Is it usual? Would it help identify a cause, and would having a cause help in any way? I'm not diabetic, and my BP is only slightly high, not enough to need treating I'm told.