The doctor might see and evaluate the causes of bleeding.The doctor might help to evaluate the sight of bleeding. A black, tarry stool indicates the presence of ulcer in the upper digestive tract.Bright red colour indicated any dysfunction or abnormalities in the lower digestive tract.The main causative agent indicating the abnormalities include haemorrhoids or diverticulitis.
After certain conclusion from the physical examination the doctor might advice for the following investigation techniques:
Nasogastric lavage: A test that may tell your doctor whether bleeding is in the upper or lower digestive tract. The procedure involves removing the contents of the stomach through a tube inserted into the stomach through the nose. If the stomach does not contain evidence of blood, the bleeding may have stopped or is more likely in the lower digestive tract.
Esophagogastroduodenoscopy (EGD). A procedure that involves inserting an endoscope, or flexible tube with a small camera on the end, through the mouth and down the esophagus to the stomach and duodenum. The doctor can use this to look for the source of bleeding. Endoscopy can also be used to collect small tissue samples for examination under a microscope (biopsy)
Colonoscopy: it is similar to the EGD in that the scope is inserted into the rectum and colon is examined. And the abnormalities are detected.
Enteroscopy: a procedure which is similar to the EGD and colonoscopy used to examine the small intestine.In some cases this involves swallowing a capsule with a tiny camera inside that transmits images to a video monitor as it passes through the digestive tract.
Barium X-ray: A procedure that uses the barium and the barium is inserted into the digestive tract and several investigations are made. The barium must be either inserted through the rectum are swallowed.
It involves injecting the radioactive material into the vein and camera is focused in it to see the images in the digestive tract to detect where the bleeding is happening.
A procedure that involves injecting a special dye into a vein that makes blood vessels visible on an X-ray or computerized tomography (CT) scan. The procedure detects bleeding as dye leaks out of blood vessels at the bleeding site.
Laparotomy. A surgical procedure in which the doctor opens and examines the abdomen. This may be necessary if other tests fail to find the cause of bleeding.
The health care providers also order lab tests when there is blood in stools. These tests may look for clotting problems, anaemia , and the presence of H. pylori infection.
Occult blood in stool:
Another "type" of blood in the stool is occult blood. Occult gastrointestinal bleeding refers to a slow loss of blood into the upper or lower gastrointestinal tract that does not change the color of the stool or result in the presence of visible bright red blood. Blood in the stool is detected only by testing the stool for blood (fecal occult blood testing) in the laboratory. Occult blood in the stool has many of the same causes as rectal bleeding, and may be associated with the same symptoms as