In this small trial of patients presenting with hemodynamically significant hematochezia and negative upper endoscopy, they were randomized to urgent colonoscopy (with 12 hours) or elective colonoscopy (within 60 hours). There were no significant differences between the groups in further bleeding, transfusion need, length of stay, or hospital cost. For now, there is no evidence that colonoscopy needs to be urgently performed in patients with hematochezia and negative upper endoscopy (abstract)
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