“These cancer cells grow, grow ... the blood is more likely to be red blood mixed with regular stool,” Roper explained.

Generally speaking, a normal stool is brown thanks to the presence of a bile pigment called stercobilin—it's produced when ...

Stool exam. You'll be asked for a poop sample ... If you have severe bleeding, the test may find low levels of red blood cells and hemoglobin (a protein in red blood cells).

A stool specimen was strongly positive for blood. Examination of the blood showed a red-cell count of 2,300,000, with a hemoglobin of 41 per cent, and a white-cell count of 19,500. The ...