None of my doctors reacted much to my eGFR of 36. Even though it was a sudden drop. I was glad to get a much higher eGFR from Cystatin C (51). I was told the truth lies in between. I am not sure whether a nuclear contrast study would harm kidneys. I avoid all contrasts that affect kidneys: @college prof may know something I don't.

Hydration and avoiding NSAID's also help. My creatinine based GFR is still 40. Because I am on (low dose) Reclast for bones I did get some extra tests but otherwise I think my nephrologist would have seen me in a year. Apparently the key is whether it is stable.

I do not have high blood pressure which would need to be addressed as well, with meds and/or diet.