ARUP's Laboratory Test Directory

0099824: Porphyrins, Fecal

Test Mnemonic: POR FECES
Methodology: High Performance Liquid Chromatography

Performed: Tue, Sat

Reported: 2-7 days

Specimen Required:  
Collect: Random stool. Freeze immediately.

Transport: 5 g stool, frozen. (Min: 1 g). CRITICAL - Protect from light.

Pediatric Collection/Transport: 1 g stool, frozen. CRITICAL - Protect from light.

Remarks: CRITICAL FROZEN.  Freeze sample immediately after collection. Protect from light during collection, storage, and shipment. Wrap in foil ASAP to protect from light.

Unacceptable Conditions: Complete timed collections (24-72 hour).  Samples stored in one gallon cans, large containers or liquid stool.

Stability: Ambient: Unacceptable; Refrigerated: Unacceptable; Frozen: 3 weeks

Reference Interval:
 
Test Number Components Reference Interval
 Coproporphyrin0-45 nmol/g dry weight
 Protoporphyrin0-100 nmol/g dry weight

Note:
Bacterial modification of fecal porphyrins is extensive.  The recommended specimen for uroporphyrin and coproporphyrin is urine (random or 24-hour). Refer to Porphyrins, Urine (0080460).  The recommended specimen for protoporphyrin is serum.  Refer to Porphyrins, Serum Total (0080429). 

CPT Code(s):
84126

 

 

 
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