I have a very healthy 28 yrs old daughter that had bloodwork done and had a GFR of 69 two months ago and recently was checked again and it was 57. She questioned her doctor and they said that this was normal. From what I understand it should not be below 90. She has been tired for over a year, has acne that she takes medication for. She is extremely athletic, has a resting pulse of 57 and no physical issues. Her grandmother has been having kidney issues but I don t know the details. I guess my question is, that GFR of 57 is a real concern, is this something that sounds normal. Thank You