A Comparison Between Diuresis Renography and the Whitaker Test in 64 Kidneys

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Abstract
Patients (57) have provided 64 dilated pelvicaliceal units for study by diuresis renography and the Whitaker test. Of 45 kidneys showing a type I or type IIIa renographic response (unobstructed), 32 were, according to Whitaker''s criteria, obstructed, 8 fell into an equivocal zone and only 5 were unobstructed. Of these kidneys (35), 33 of which were associated with moderate or severe loin pain, were operated on for presumed obstruction with generally excellent symptomatic and renographic result. Thus, the detection of a type I or type IIIa response in a dilated, painful system cannot be taken to exclude obstruction. Better correlation was obtained between renography and the Whitaker test in patients exhibiting a type IIIb or type II renographic response. Diuresis renography is a sensitive indicator of urodynamic disturbance in the upper urinary tract and an ideal means of evaluating post-operative progress. The Whitaker test provides a reliable means of selecting patients who will benefit from pyeloplasty.

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