Days Set Up
Tuesday, Thursday
Analytic Time

4 - 5 days

MiChart Code
Porphyrins, Feces
Soft Order Code

Test Updated:


Porphyrins, Feces

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All specimens should be accompanied by a requisition.

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Test Overview

Test Methodology

High-Performance Liquid Chromatography (HPLC)

Test Usage

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.

Reference Range

Interpretive report provided.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Specimen Requirements

Collection Offsite

Patient should be instructed to refrain from red meat and aspirin-containing medications for 3 days prior to and during specimen collection period. No barium, laxatives, or enemas may be used within 24 hours of starting the collection. Collect stool for a duration of 48, 72, or 96 hours; freeze (preferred) or refrigerate and send entire collection. Note collection duration, start date and time and end date and time on requisition. Also include a list of medications the patient is currently taking.

Normal Volume
Entire 48 - 96 hour stool collection
Minimum Volume
24 hour collection is adequate if the collection volume is approximately 100 g

Billing Information

CPT Code
Pro Fee Code

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Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.