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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.
Expert answer. Debbie M. replied: GFR is based on age, sex, creatinine level and race. Though it is expected that a person with one kidney will have a reduced GFR, it isn't possible to provide what the normal GFR level would be for a person with one kidney.