Porphyrins, 24-hour stool

Alphabetical Test listing

Porphyrins, 24-hour stool-994

Porphyrins, 24-hour stool

Evaluation of patients who present with signs or symptoms suggestive of porphyria cutanea tarda, hereditary coproporphyria, variegate porphyria, congenital erythropoietic porphyria, erythropoietic protoporphyria, or X-linked dominant protoporphyria.


 Specimens smaller than 100 g may not provide interpretable results

  • Patient should be instructed to refrain from red meat and aspirin-containing medications for 3 days prior to, as well as during, specimen collection.
  • No barium, laxatives, or enemas may be used within 24 hours of starting the collection.
Stool, timed collection (48, 72 or 96-hr)
100 g
10 g
  • Use as many containers as necessary
  • Label all containers X of X (eg. 1 of 2, 2 of 2)


Submit all containers


Mayo stool collection jar

  • Length of collection period is required
  • Include a list of medications the patient is currently taking
  • Indicate patient compliance of diet/medications recommendations listed in patient preparation

Frozen (preferred) - 14 days

Refrigerated - 14 days

1 week
Mayo Clinic Laboratories (FQPPS): R-MM
Tu, Th
7 - 11 days

High-Performance Liquid Chromatography (HPLC)

Porphyrins are quantified by fluorescence


See report