[Mathematic evaluation of the deterioration of the renal function in chronic progressive kidney diseases].

The progression of chronic renal failure has been claimed to be predictable by means of mathematical models. The study shows that the logarithm of serum creatinine is less accurate than the reciprocal method for predicting the course of renal insufficiency. The fact that the reciprocal of serum creatinine decline linearly with time suggests that glomerular function is lost at a constant rate.