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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.
Normal value for GFR (which vary depending on age, sex, and body size) is approximately 125mls/min (=180L/day) in young men. - Normal value declines with age, is lower in women, and lower with smaller body size. Functions of the Kidney. 1.) Removal of End Products of Metabolism.