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Abstract
Several methods have been published for estimating creatinine clearance from serum creatinine concentrations. Such estimates of creatinine clearance are widely used for dosage adjustments of drugs which are primarily eliminated through the kidneys in patients with reduced renal function. Most of these methods involve the use of equations, requiring a few steps of calculations. A simple and easy-to-use nomogram is presented for estimating creatinine clearance from serum creatinine concentration, plus the age, sex, and bodyweight of the individual patient. This nomogram is based on the linear relationship between creatinine clearance and the reciprocal value of the serum creatinine concentration, where the slope of this relationship is determined by the rate of creatinine production. The rate of creatinine production, however, is related to age, sex, and bodyweight. These physical characteristics are therefore used to scale the slopes of the relationships between creatinine clearance and serum creatinine concentration. The validity of the nomogram was tested in 50 consecutive hospitalised patients for which creatinine clearance was measured. There was an excellent correlation (r = 0.903) between predicted and observed creatinine clearance values.
Published Version
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