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Summary A simple and informative test is described which will help distinguish the floppy ureter from the obstructed one. The upper tract is perfused at a constant flow rate and the back pressure is measured through a single channel. The procedure is performed under fluoroscopic control and the activity of the ureter is observed. The test has proved to be of value in both children and adults.
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Robert H. Whitaker (1973) studied this question.
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