What is the meaning of occult blood

Stool occult blood refers to gastrointestinal bleeding less, but red blood cells opinion is digested and destroyed, stool has no abnormal changes, naked eye and microscope can not confirm the bleeding.

Stool occult blood can be detected by immune method, chemical method, etc., caused by various reasons of gastrointestinal bleeding, such as gastric ulcer, duodenal ulcer patients, stool occult blood test is mostly positive or intermittent positive, some digestive tract malignant tumors early, may also be manifested as occult blood test positive, so stool occult blood test can be used as the digestive tract malignant tumor screening index of choice, can early detection of rectal cancer, colon cancer and so on.