Holy shit, I just finished that lecture. That's borderline stage 3 CKD. Hopefully you don't get any uremic symptoms (show at stage 5 or 6 when GFR goes below 15-30). Belth, GFR is not something you really need to wait around for another opinion. It is what it is. They probably did a iothalamate or inulin test. Now they'll check his Vit D hormones as well as his parathyroid, check for anemia, and do a host of lab tests. If there is any hypertension then that will have to be aggressively managed and if you don't then they'll probably do something about blood pressure management anyway because that is the number 1 risk for disease progression.