label: Elevated urinary porphyrin level
label_lc: elevated urinary porphyrin level
description: "The amount of a porphyrin compound in the urine, normalized for urine concentration, is above the upper limit of normal. Porphrins are natural pigments containing a fundamental skeleton of four pyrrole nuclei united through the alpha-positions by four methine groups to form a macrocyclic structure. Porpyrins giove rise to heme and combalamine."