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high creatinine normal bun

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?
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