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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 blood test, called GFR, measures how much blood your kidneys filter each minute. Your doctor uses this information to see how well your kidneys are working. A GFR of over 60 means your kidneys are working fine. A GFR of 60 or lower may mean you have kidney disease.