Prediction of creatinine clearance from serum creatinine concentration based on lean body mass.

An equation for predicting endogenous creatinine clearance (CrCl) in adults and children (with both stable and unstable renal function) from serum creatinine concentration is presented. The predictions are compared with four other available estimating methods, bases on values in 110 subjects with renal impairment of widely differing degrees. In patients with stable and with unstable renal function the corelaion between measured and predicted CrCl was better with the new equation. In patients with rapid changing renal function the new equation resulted in accurate predictions CrCl within a few hours after the change, as opposed to several with the other methods. The elimination rate constant of the aminoglycoside antibiotic amikacin correlated more precisely with CrCl values estimated from the new equation that with those measured doing 24 hr or with the other prediction methods.