Source:http://linkedlifedata.com/resource/umls/id/C0201811
NCI: A test to check for blood in the stool. Small samples of stool are placed on special cards and sent to a doctor or laboratory for testing. Blood in the stool may be a sign of colorectal cancer.,NCI: A noninvasive test that detects the presence of hidden (occult) blood in the stool. This is commonly performed to screen for colon cancer.