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Porphyrins, feces (087-0271)
Test Mnemonic:


Specimen Requirements:

Random stool, 50 - 100 g; refrigerate (up to 24-hours), freeze and protect from light. 

Test Included:

Reflex if elevated: fractionate individual porphyrins by HPLC.


Collect Random Stool.


Unbreakable plastic container with firmly closed top.

Minimum Volume:

10 g


Protect from light and freeze until shipped.  See Shipping Instructions for more details.


Stable when protected from light and frozen.

Causes for Rejection:

Samples not frozen or light protected will not be rejected, but their condition will be recorded in the results report.

Reference Range:

0 - 200 nmol/g dry weight.

Turnaround Time:

Routine; test is performed monthly.


Extraction and fluorometry


Samples are accepted 24 hours per day at Sample Management, 7.412 CSW or from 8 AM - 5 PM, Monday - Friday at the Porphyria Laboratory, 3.102 Ewing Hall, 700 Harborside Drive, Galveston, TX; Phone (409) 772-9103 or 4661.


Porphyria Laboratory


Fecal porphyrins, stool porphyrins

Clinical Indication:

A second line test to differentiate certain porphyrias, particularly hereditary coproporphyria, variegate porphyria, and congenital erythropoietic porphyria. 

Patient Preparation :

Not applicable.

CPT 4 Code:



Call Porphyria Laboratory at (409) 772-9103 or 4661 if any questions.

When ordering tests for which Medicare or Medicaid reimbursement will be sought, physicians should only order tests that are medically necessary for the diagnosis or treatment of the patient. Components of the organ or disease panels may be ordered individually. The diagnostic information must substantiate all tests ordered and must be in the form of an ICD-10 code or its verbal equivalent.
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