Fecal bilirubin

Biliary pigment is a general term for a series of catabolic products of iron porphyrins such as heme, including bilirubin, bilirubin, procholin, and choline. Among them, bilirubin is a precursor of bilirubin, and probili and bilirubin are products of bilirubin. Except for the colorlessness of procholin, the other components in this type of metabolites have color, so they are called bile pigments. Bile pigments are the main pigments that make up normal stool and urine color.