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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.
Glomerular filtration rate (GFR). An effective way of assessing how well your kidneys are working is to calculate your glomerular filtration rate (GFR). GFR is a measurement of how many millilitres (ml) of waste fluid your kidneys can filter from the blood in a minute (measured in ml/min).lomerular filtration rate (GFR). An effective way of assessing how well your kidneys are working is to calculate your glomerular filtration rate (GFR). GFR is a measurement of how many millilitres (ml) of waste fluid your kidneys can filter from the blood in a minute (measured in ml/min).