Case List History Objectives Radiology Images Questions COLORECTAL DISEASE Case #7 - A 70 year old female with passing bright red blood per rectum DISCUSSION QUESTIONS: 9.) What are the limitations of these additional studies? The patient must be actively bleeding for these further studies to be useful. For a tagged red cell scan, the rate of bleeding should be at least 0.5cc/min. For arteriography to show source of bleeding, the rate of bleeding should be at least 1 cc/min.
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