A reddish pigment in urine and feces in certain conditions.
Substances present in the urine in congenital or metabolic disease, such as porphyria.
A porphyrin that plays an intermediate role in the synthesis of protoporphyrin IX. It is excreted in significant amounts in the urine in porphyria.
A red pigment present in the urine and feces in cases of porphyria; may also be present in the urine of persons taking certain drugs.