A film reading exercise was developed to test the advisability and accuracy of using one "postinfusion" roentgenogram instead of a series of films for a complete antegrade urographic evaluation. The experience of the radiologist making the interpretations was also considered. In most cases a single eight-minute postinfusion delayed film showed enough detail to rule out pathology when none existed and adequately revealed either specific abnormal findings or suggested an abnormality existed when such was indeed present. No false negative call was made by any of the radiologists, but experience did aid in detailing the pathology.
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