Lab Test

Porphyrins, 24 Hour Urine Quantitative

Test Codes

LabCorp #3194, EPIC: LAB6269, SOFT: XPOUR


Specimen Collection Criteria

Collect: 24 hour urine sample with no preservative.

  • Keep 24 hour urine specimen iced or refrigerated during collection.
  • Include start and end dates and times for the collection period on the specimen container.
  • Protect specimen from light during and after collection.
Urine Preservative Options
No Preservative
6N Hydrochloric Acid
Boric Acid (10g)
Sodium Carbonate
50% Acetic Acid

Physician Office/Draw Specimen Preparation

Protect specimen from light. Maintain specimens refrigerated (2-8°C or 36-46°F) prior to transport.

Preparation for Courier Transport

Transport: Entire 24 hour urine collection, refrigerated (2-8°C or 36-46°F).

Rejection Criteria

  • Random urine specimens.
  • Specimens with preservatives.
  • Specimens not collected and processed as indicated.

In-Lab Processing

Protect specimen from light. Measure total volume of 24 hour urine specimen. Record total volume and collection start and end dates and times in the LIS system. Aliquot 2.0 mL from the well-mixed 24 hour urine collection. (Minimum: 1.5 mL)


Specimen Stability for Testing:

Room Temperature (20-26°C or 68-78.8°F): Unacceptable
Refrigerated (2-8°C or 36-46°F): 7 days
Frozen (-20°C/-4°F or below): 14 days

Specimen Storage in Department Prior to Disposal:

Specimen retention time is determined by the policy of the reference laboratory. Contact the Send Outs Laboratory with any questions.


Sent to Laboratory Corporation of America (LabCorp), Research Triangle Park, NC.


Tuesday – Friday.
Results available in 3-5 days.

Reference Range

By report.

Test Methodology

High-Pressure Liquid Chromatography (HPLC) with Fluorometric Detection.


This assay includes: coproporphyrins, uroporphyrins, and intermediate porphyrins (heptacarboxyl, hexacarboxyl, and pentacarboxyl).

CPT Codes



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This directory currently reflects information only for specimens collected and/or processed at the
Farmington Hills, Grosse Pointe, Royal Oak, and Troy campuses.