What does occult blood test mean?

The clinical significance of fecal occult blood test is to determine whether there is a small amount of bleeding in the digestive tract. Because there is a small amount of bleeding in the digestive tract, the appearance color of the stool does not change significantly. After microscopic examination, there is no abnormality. However, after fecal occult blood test, it can be judged whether there is bleeding in the digestive tract. Therefore, positive fecal occult blood can be seen in gastrointestinal bleeding or tumors of the digestive system.