My U Creatinine number keeps climbing, What is the difference between U Creatinine and Creatinine? I find this a bit confusing.

The urine creatinine (U creatinine) is a measure of how concentrated your urine is and does not measure kidney function.  The serum creatinine is used to estimate kidney function.  The urine creatinine is only used to measure the concentration of the urine.

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