My creatinine was at 2.8 at one time 3 years ago but I was going through a "triple - bypass" at the time. I've been at least 1.5 for the past four years. Doing the math formula my GFR is around 42. My Neph. says 1.5 is normal for me??? He may be considering my age at 77. Like I said I'm going to spend a lot of time doing my own research trying different things watching out for "snake oil". Diet and natural stuff.