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Generally speaking, normal creatinine level ranges from 0.5 to 1.1 mg/dl for female and 0.6 to 1.2 mg/dl for male. It is possible that the normal creatinine level for people with only one kidney is a little higher.
The results of the test mean the following: 1  a GFR of 60 or more is in the normal range. 2  a GFR of less than 60 may mean you have kidney disease. 3  a GFR of 15 or less is called kidney failure.