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。
Many patients with colon polyps are tested negative for stool occult blood.
许多患者的粪便潜血检测结果呈阴性，但却患有结肠息肉。
Many patients with colon polyps are tested negative for stool occult blood.
许多患者的粪便潜血检测结果呈阴性，但却患有结肠息肉。
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