occult gastrointestinal bleeding

基本解释

You should send it to do black stool occult blood test, such as occult blood positive, that upper gastrointestinal bleeding, it should be consistent with a water wash corrosive link.
你应该送黑便做大便隐血试验，如隐血阳性，说明上消化道出血，那就应与洗甲水的腐蚀性联系起来。
Barium radiographs of the upper and lower gastrointestinal tract have limited utility in the setting of occult bleeding because of their inability to biopsy or treat lesions that are identified.
影像学钡的上部和下部胃肠道只有有限的实用背景神秘流血，因为他们无法治疗病变活检或所认同。