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失血量的估计对进一步处理极为重要。一般每日出血量在5 ml以上,大便色不变,但匿血试验就可以为阳性,50～100 ml以上出现黑粪。以呕血、便血的数量作为估计失血量的资料,往往不太精确。因为呕血与便血常分别混有胃内容与粪便,另一方面部分血液尚贮留在胃肠道内,仍未排出体外。因此可以根据血容量减少导致周围循环的改变,作出判断。
Estimation of the amount of blood loss is crucial for further processing. General daily bleeding in more than 5 ml, stool color unchanged, but the blood test can be positive, 50 to 100 ml or more black manure. To vomiting blood, blood in the stool as the estimated amount of blood loss information, often not very accurate. Because hematemesis and hematochezia are often mixed with stomach contents and stool, on the other hand, part of the blood is still stored in the gastrointestinal tract, still not excreted. Therefore, blood volume reduction can lead to changes in the surrounding circulation, to make judgments.