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Test Name:Porphyrins, quantitative, 24-hour urine
Test Number:13486
Collect:Urine (24-hour), no preservative
Protect from light
Minimum Volume:1.5 mL aliquot
Container:LabCorp 12mL amber transport tube
Processing:Mix well and submit a 2mL aliquot, protected from light
Transport/Stability:Refrigerated - 7 days
Ambient - NO
Frozen - 14 days

Protect from light
Alternate Names:Coproporphyrin
Uroporphyrin
PORPH24UR
LAB13486
Performing Lab:LabCorp Burlington (003194); R-LC
Days Set Up:Mo - Fr
Expected TAT:3 - 4 days
Ref. Ranges:Coproporphyrin (CP) I: 0−24 μg/24 hrs
Coproporphyrin (CP) III: 0−74 μg/24 hrs
Heptacarboxylporphyrins (7-CP): 0−4 μg/24 hrs
Hexacarboxylporphyrins (6-CP): 0−1 μg/24 hrs
Pentacarboxylporphyrins (5-CP): 0−4 μg/24 hrs
Uroporphyrins (UP): 0−24 μg/24 hours
Collection/
Processing Details:
Useful for: Evaluate porphyrias, including those involving deficiencies of enzymes which are needed for heme synthesis and chemical porphyrias.

  • Mix 24 hr collection well.
  • Measure and record total urine volume.
  • Transfer a 2mL (minimum 1.5mL) aliquot into a LabCorp amber plastic transport tube with cap.
  • Label with patient name and 2nd ID, source and total volume.
  • If amber transport tubes are unavailable, cover transport tube completely, top and bottom, with aluminum foil. Identify specimen with patient's name directly on the amber transport tube AND on the outside of the aluminum foil and secure with tape.
  • Specimen must be kept refrigerated during transport.
Method:High-pressure liquid chromatography (HPLC) with fluorometric detection
CPT Codes:84120
Related Article:Two Types of Porphyria
Date Created:04/11/2019
Revised Date:05/20/2019