During a 7-week period 123I hippuran was used instead of 131I hippuran for all renographies of transplanted kidneys on Wednesdays. Only in well functioning grafts with a diuresis above 2 ml/min during the examination a scintigraphic improvement of renal and upper urinary visualization was obtained. It is concluded that alternating routine use of the expensive 123I hippuran in control of renal grafts cannot be recommended.
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