The last day of my period was the 20th of November. I have not had any symptoms of pregnancy but I think that I may be pregnant. I should have already had or started my period by now but I am still waiting. I would be around 3 weeks pregnant but I am not sure if it is to early to take a pregnancy test.
Learn more about this top honor. The fecal occult blood test (FOBT) is a lab test used to check stool samples for hidden (occult) blood. Occult blood in the stool may indicate colon cancer or polyps in the colon or rectum â though not all cancers or polyps bleed. Typically, occult blood is passed in such small amounts that it can be detected only through the chemicals used in a fecal occult blood test.
First, it is more sensitive for blood. This means that given the same amount of blood in the stool, the immunologic fecal occult blood test will more frequently be abnormal.In other words, it will more frequently detect cancers and precancerous polyps. Second, it is more specific for blood. chemical fecal occult blood test is inexpensive and easy, but it has several disadvantages. 1  Substances in fruits and vegetables can mimic heme and cause chemical fecal occult blood tests to be falsely positive, that is, falsely abnormal.