The blood in the feces that can be detected only by chemical tests.
non-visible blood in the stool, which can easily be detected by a simple laboratory test.
to identify gastrointestinal bleeding by a chemical test or microscopic exam for blood especially in the feces that is not apparent on visual inspection.
Blood in the stool that is not always visible to the naked eye. This type of bleeding is detected by performing a laboratory test on a stool sample.
presence of blood in so small a quantity that it cannot be seen with the unaided eye.
Usually: Occult blood test. A test used in screening for blood found in the stool, sputum or urine. The most common test is for hidden blood in the stool, also known as a stool guaiac or hemoccult test, which usually indicates the presence of ulceration or cancer.