[Kidney function test after partial nephrectomy (author's transl)].

A new method for testing the function of the kidney after partial nephrectomy is reported. By means of radioisotope renography, urography and radioisotope clearance ('single-shot' method) it is possible to prove the function of the single kidney. The clearance in regard to the size of the shadow of the kidney assessed by urography allows to estimate the specified kidney function. We used these methods in ten patients and we detected that the loss of function is more extensive than expected by the operative reduction of the kidney parenchyma only. The causes for this are discussed.