Final answer:
The normal creatinine range varies depending on the method of testing and age. Blood tests typically use a range of 0.8-1.2 mg/dl for males and 0.6-0.9 mg/dl for females, while a 24-hour urine collection has a range of 90-139 ml/min for males under 40 and 80-125 ml/min for females under 40. The values decrease with age.
Step-by-step explanation:
The normal creatinine range varies depending on the method of testing and age.
For blood tests, the normal range of plasma creatinine is 0.8-1.2 mg/dl for males and 0.6-0.9 mg/dl for females.
However, for a 24-hour urine collection, normal creatinine clearance values are 90-139 ml/min for adult males less than 40 years old, and 80-125 ml/min for adult females less than 40 years old.
Values decrease by 6.5 ml/min for each decade of life after 40.