The routine stool examination is mainly used for digestive system diseases, and is also a basic item in daily physical examination. If there is an increase of blood cells in the stool, it is mainly considered to be a problem in the digestive system. In the examination of the stool will take about 3-5ml of stool can be examined, try to select the mucus, pus, blood, color incorrect part of the stool test, before the stool test try to avoid the use of antibiotic drugs in the first 3 days, to avoid affecting the test results, 3 days before the test diet also avoid iron, green vegetables, animal blood products, otherwise the test results may be interfered with.