[A new concept for detailed measuring of the excretory function of the kidney].

A new method to investigate renal function in detail without use of catheters is demonstrated. This method combines the advantages of two techniques, the physiological clearance measurement technique and the isotope nephrogram technique. The function of each kidney is quantitated in terms of the velocity of renal blood flow, the velocity of filtration and secretion and the velocity of urine flow to the bladder. The new concept is illustrated by two clinical examples.