[Effect of renovascular roentgen contrast media on the function of the healthy kidney--an individual comparison].

In 50 patients with healthy kidneys the excretion of tubular enzymes was determined quantitatively before and after administration of an ionic and a non-ionic contrast medium and compared intra-individually. Both preparations produced a highly significant increase in enzyme levels to about twice the initial value, the increase being significantly lower with the non-ionic contrast medium. This effect was fully reversible within 24 hours. No noticeable change was seen within the examination period of 48 hours in respect of creatinine and creatinine clearance levels.