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。
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