I exercise 5 days a week for 60 to 75 minutes (spinning class and then resistance training). I am 50. The last three years my creatinine level is slightly high and eGFRis slightly low. When I work out, I always sweat a lot and the smell is ammonia like. My blood pressure is normal; always less than 120/80.
You can have albumin in your urine as long as it is below 30. My albumin was 2. Doctor said I was fine. Normal creatinine range is .8 to 1.4. Mine came back at 1.35. It increased from 1.2(lowest level was 1.12). My eGFR went from 93 to 75. I did change my workout schedule. I started working out 7 days a week. I increased the intensity of the workout and I started to consume more protein. I gained more muscle mass. High intensity exercise and heavy weight lifting do affect your creatinine and apparently, your eGFR. My numbers are still in the normal range, but I will go for a checkup in 4 months.