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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.
GFR is the abbreviation of Glomerular Filtration Rate which is a test used to check how well the kidneys are working. Normally, GFR ranges from 90-120mL/min/1.73m2. And for kidney disease patients, they usually have low GFR.