男性,36岁。溃疡病史,近2天来黑粪,每天1~2次,估计其出血量大约为()

男性,36岁。溃疡病史,近2天来黑粪,每天12次,估计其出血量大约为() A. 5070ml B. 6080ml C. 7090ml D. 80100ml E. 90110ml 答案:A Answer: A Analysis: The patient is a 36-year-old male with a history of ulcers, presenting with melena (black, tarry stools). To estimate the amount of bleeding, it is important to consider the average blood loss associated with melena, which is about 50-70ml per episode. Therefore, the correct answer is A.