- One of two porphyrin compounds found normally in feces as a decomposition product of bilirubin (hence, from hemoglobin); certain corproporphyrins are elevated in certain porphyrias. SEE ALSO: porphyrinogens.
* * *cop·ro·por·phy·rin .käp-rə-'pȯr-fə-rən n any of four isomeric porphyrins C36H38N4O8 of which types I and III are found in feces and urine esp. in certain pathological conditions and also in yeast
* * *n.a porphyrin compound formed during the synthesis of protoporphyrin IX, a precursor of haem. Coproporphyrin is excreted in the faeces in hereditary coproporphyria.
* * *cop·ro·por·phy·rin (kop″ro-porґfə-rin) a porphyrin produced by oxidation of the methylene bridges in coproporphyrinogen. Four isomers are possible, but only two exist naturally. Coproporphyrin III is excreted in the feces and urine in hereditary coproporphyria and variegate porphyria, particularly during acute attacks. Coproporphyrin I is excreted in the feces and urine in congenital erythropoietic porphyria.
Medical dictionary. 2011.