I have been diagnosed with NS MCD and I pay close attention to my GFR despite my renal disease mainly involving protein loss. My GFR was low on initial diagnosis, but I was very sick. Since then, fortunately, it has “fluctuated,” but not been below 70. I would definitely suggest you be under the care of a nephrologist who follows your condition closely and expects your concerns. Did you have a renal biopsy for your MCD diagnosis?