Abstract
The occult blood testing of stool in the diagnosis of the colorectal lesions were evaluated with the results of the routine proctosigmoidoscopy and guaiac slide test. The patients were divided to the following 2 groups : 1) Ones who had symptoms suggestive of the lower intestinal tract disorders. 2) Ones who had digestive disorders other than the intestinal tracts or ones to whom the proctosigmoidoscopy were undertaken as a routine preoperative examination. Guaiac slide tests (Shionogi Test) were performed Once for each patient (1968 cases) and 2500 cases including all these cases were undertaken protosigmoidoscopy. The rate of positive occult blood testing were 38.5% of mucosal carcinoma, 54.5% of submucosal invading carcinoma, 93.2% of advanced carcinoma and 37.5% of adenoma. These results suggest that single guaiac slide test is insufficient for detecting colorectal carcinoma and the false negative rate for them is 40.2% as a whole.
