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HelpCatalog ID PQNRU Porphyrins, Quantitative, Random, Urine
Reporting Name
Porphyrins, QN, Random, UUseful For
Preferred test to begin assessment for congenital erythropoietic porphyria and porphyria cutanea tarda and during symptomatic periods for acute intermittent porphyria, hereditary coproporphyria, and variegate porphyria when specimen transport will not exceed 72 hours
Ordering Guidance
This random urine test should be ordered when the specimen will reach Mayo Clinic Laboratories within 72 hours. If transportation will take longer than 72 hours, order PQNU / Porphyrins, Quantitative, 24 Hour, Urine and follow collection guidelines.
Shipping Instructions
Ship specimen in amber bottle to protect from light.
Necessary Information
Include a list of medications the patient is currently taking.
Specimen Required
Patient Preparation: Patient should not consume any alcohol for the 24 hours before specimen collection.
Supplies: Urine Container - Amber, 60 mL (T596)
Container/Tube: Amber, 60-mL urine container
Specimen Volume: 20 to 50 mL
Collection Instructions: Collect a random urine specimen.
Specimen Minimum Volume
15 mL
Reference Values
Uroporphyrins, Octacarboxyl:
≤30 nmol/L
Heptacarboxylporphyrins:
≤7 nmol/L
Hexacarboxylporphyrins:
≤2 nmol/L
Pentacarboxyporphyrins:
≤5 nmol/L
Copropprphyrin, Tetracboxyl:
≤110 nmol/L
Porphobilinogen:
≤1.3 mcmol/L
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Urine | Frozen | 72 hours | LIGHT PROTECTED |
Reject Due To
All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.Day(s) Performed
Monday through Friday
Test Classification
This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. It has not been cleared or approved by the US Food and Drug Administration.Testing Algorithm
The following algorithms are available:
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CPT Code Information
84110-Porphobilinogen, quantitative
84120-Porphyrins, quantitation and fractionation
Specimen Type
UrinePerforming Laboratory
Mayo Clinic Laboratories in Rochester
Special Instructions
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| PQNRU | Porphyrins, QN, Random, U | 93707-8 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| 32332 | Uroporphyrin, Octa | 25166-0 |
| 32333 | Heptacarboxylporphyrins | 34314-5 |
| 32334 | Hexacarboxylporphyrins | 96795-0 |
| 32335 | Pentacarboxylporphyrins | 34352-5 |
| 32336 | Coproporphyrin, Tetra | 25167-8 |
| 32337 | Porphobilinogen | 2811-8 |
| 32338 | Interpretation | 49291-8 |
Method Name
High-Performance Liquid Chromatography (HPLC) with Fluorometric Detection/Liquid Chromatography Tandem Mass Spectrometry (LC-MS/MS)
Forms
If not ordering electronically, complete, print, and send a Biochemical Genetics Test Request (T798) with the specimen.