|Methodology||High-Pressure Liquid Chromatography (HPLC)|
|Description||Porphyrins are quantitated by fluorescence.
Analysis of the fecal porphyrins should be the first choice of available tests when either coproporphyria or variegate porphyria are suspected or when dermopathic porphyria must be differentiated for a diagnosis of porphyria cutanea tarda, coproporphyria, or variegate porphyria.
|Specimen||Stool specimen (48-, 72-, or 96-hour). 24-Hour collection is adequate if the collection volume is approximately 100 g. If 24-hour collection does not weigh 100 g, continue collection period until a 100 g specimen is obtained. SEND ENTIRE COLLECTION FROZEN on dry ice in containers supplied by NorDx.
See "Stool Collections."
|Reference Values||See "Porphyrins, Feces Reference Values"
See "Porphyrinogens, Porphyrins, and Porphyrias".
|Analytic Time||3 Days|
|Day(s) Test Set Up||Monday through Friday|