A comparison of diuresis renography, the Whitaker test and renal pelvic morphology in idiopathic hydronephrosis.

Diuresis renography and the Whitaker test are established methods of diagnosing obstruction in dilated renal pelves. These techniques have been compared in 36 patients with radiologically demonstrated idiopathic hydronephrosis and evaluated, where possible, against renal pelvic morphological features. The agreement between the results of the tests was as follows: diuresis renography/Whitaker test 67%; diuresis renography/renal pelvic morphology 74%; Whitaker test/renal pelvic morphology 58%. Both diuresis renography and the Whitaker test are indicated in some cases of idiopathic hydronephrosis.