Wondering if anybody has any idea of why someones creatinine would be consistently high, but BUN is always normal? I have had creatinine ranging from 1.27 to 1.6 and everywhere in between for the past at least couple years. Up and down then up again, then down again, etc. I have always been a very serious weight lifter but have laid off the gym for the past 6 months now because I wanted to see if the creatinine would go down. I have lost a lot of muscle in the past few months but creatinine is still above the normal range. doesn't seem to be changing. I thought that with CKD that BUN would be elevated along with creatinine. Is that not always the case? I have no protein or blood in urine. Other labs are normal. Just creatinine constantly elevated. Any ideas?