Alberta Precision Laboratories

--- Query Results ---

Organization:

Alberta Precision Laboratories

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Test Name/Synonym:

Porphyrin, Quantitative, 24 Hour Urine
Porphyrin, Quantitative, Random, Urine (Coproporphyrin, Uroporphyrin) - Calgary Zone (CLS)

Test Includes:

Coproporphyrin, Uroporphyrin and Creatinine urine

LABID (Connect Care):

Random: LAB4672
24 Hour: LAB4671

Primary Container:

Random: Sterile Container
24 Hour: 24 Hour Urine Container - NACARB
See Specimen Collection Requirements

Specimen Collection Requirements:

The preferred sample for patients of all ages is 24 hour urine.
Send random urines to Analytical Toxicology to assess suitability.

24 hour urine:
Urine Creatinine is ordered as part of the U24H.
It is acceptable to submit a Urine Creatinine for testing when collected in sodium carbonate for this test only.

24 hour urine should be collected in an opaque container with 5 g sodium carbonate added to the container before the collection begins.
Vials of sodium carbonate preservative are available from Analytical Toxicology: APL.CGYToxicologyMLA@albertaprecisonlabs.ca.

Refrigerate during collection.

Extra-regional: If sodium carbonate is not available, mix, aliquot and freeze immediately after collection.

Random urine:
Collect in an opaque container and send to lab immediately after collection.
If unable to send to lab immediately, freeze specimen (in opaque container, or foil wrapped container) and transport on ice to DSC.

Processing:

Sample or sample aliquot must be protected from light by wrapping entire container in foil.
Specimens not protected from light will be rejected.

24 hour urine aliquots:

Submit 10 mL aliquot of 24 hour urine.
Refrigerate foil wrapped sample aliquot and ship to the DSC on ice.
Record 24 hour volume and collection (start & end) dates and times in space provided on requisition.

Random urine:

pH must be >7.0. Adjust pH with sodium hydroxide if necessary, or aliquot and freeze immediately after collection.
Send foil wrapped frozen samples on ice to DSC.
If urine porphobilinogen is also ordered, separate aliquots are required for each test.

DSC:

Ensure frozen specimens do not thaw.

Testing Schedule:

Biweekly

Reference Interval:

24 Hour urine:

Coproporphyrin	24-190 nmol/24 hours
Uroporphyrin	less than 36 nmol/24 hours

Random urine: (after normalization to urine creatinine)

Coproporphyrin	Less than or equal to 20 nmol/mmol
Uroporphyrin	Less than or equal to 4 nmol/mmol

Testing Area:

Toxicology

Performing Site:

Diagnostic and Scientific Centre

Last Updated On:

Thursday, April 24, 2025