由于结肠直肠病变的早期及晚期都倾向于出血,检测粪便中的血液早已被推荐为筛选试验,以期发现癌前期或早期病变的预防从而改善存活率和减少死亡。目前采用的粪便隐血试验是以愈创木树脂或其它无色染料为基础的,这些非特异的定性试验常因假阳性或假阴性而使应用受限。新近提出的免疫化学技术和Hemo Since both early and late colorectal lesions tend to bleed, testing for fecal blood has long been recommended as a screening test to detect the prevention of precancerous or early stage lesions to improve survival and reduce death. The currently used fecal occult blood tests are based on guaiac wood or other leuco dyes. These non-specific qualitative tests often limit the application due to false positives or false negatives. Newly proposed immunochemical techniques and Hemo