stercobilinogen

The stercobilinogen can not be reabsorbed and remains in the intestine.

The remainder travels down the digestive tract and is converted to stercobilinogen.

In the intestine, bilirubin is converted by bacteria to stercobilinogen.

In obstructive jaundice, no bilirubin reaches the small intestine, meaning that there is no formation of stercobilinogen.

The bacteria in the adult gut convert conjugated bilirubin to stercobilinogen which is then oxidized to stercobilin and excreted in the stool.

Intestinal bacteria convert the conjugated bilirubin that is excreted by the bile duct into the intestine into urobilinogen and stercobilinogen.

Specifically, urobilinogen can be reduced to form mesobilirubinogen, and mesobilirubinogen can be further reduced to form stercobilinogen.

It can either be further converted into stercobilinogen, which is then oxidized to stercobilin and passed out in the faeces, or it can be reabsorbed by the intestinal cells, transported in the blood to the kidneys, and passed out in the urine as the oxidised product urobilin.