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。
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.
方法：对382例结直肠癌患者粪便隐血试验与肉眼血便、癌胚抗原（CEA）、肿瘤部位、病理分型、肿瘤分期的关系进行分析。
Methods: The correlation of FOBT with gross blood stool, carcinoembryonic antigen (CEA), tumor site, histopathologic type and the stage of tumor was analyzed in 382 patients with colorectal cancer.
方法：对382例结直肠癌患者粪便隐血试验与肉眼血便、癌胚抗原（CEA）、肿瘤部位、病理分型、肿瘤分期的关系进行分析。
Methods: The correlation of FOBT with gross blood stool, carcinoembryonic antigen (CEA), tumor site, histopathologic type and the stage of tumor was analyzed in 382 patients with colorectal cancer.
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