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Test Code PTP Porphyrins, Total, Plasma

Reporting Name

Porphyrins, Total, P

Useful For

Monitoring treatment of patients with porphyria cutanea tarda

Reflex Tests

Test ID Reporting Name Available Separately Always Performed
PFP Porphyrins, Fractionation, P No No

Testing Algorithm

If total porphyrins are above 1.0 mcg/dL, then porphyrin fractionation will be performed at an additional charge.


The following algorithms are available in Special Instructions:

-Porphyria (Acute) Testing Algorithm

-Porphyria (Cutaneous) Testing Algorithm

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Specimen Type


Shipping Instructions

Ship specimen in amber vial to protect from light.

Necessary Information

Include a list of medications the patient is currently taking.

Specimen Required

Patient Preparation: Patient should abstain from alcohol for at least 24 hours prior to specimen collection.

Supplies: Amber Frosted Tube, 5 mL (T192)

Collection Container/Tube:

Preferred: Green top (heparin)

Acceptable: Lavender top (EDTA)

Submission Container/Tube: Amber vial

Specimen Volume: 3 mL

Collection Instructions:

1. Centrifuge specimen and aliquot plasma into amber vial.

2. Send plasma frozen.

Specimen Minimum Volume

1 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Plasma Frozen 14 days LIGHT PROTECTED

Reference Values

≤1.0 mcg/dL

Day(s) and Time(s) Performed

Monday; 8 a.m.

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.

CPT Code Information

84311-Porphyrins, total

82542-Porphyrins, fractionation (if appropriate)

LOINC Code Information

Test ID Test Order Name Order LOINC Value
PTP Porphyrins, Total, P 2815-9


Result ID Test Result Name Result LOINC Value
8731 Porphyrins, Total, P 2815-9
34252 Reviewed By 18771-6
33869 Interpretation 59462-2

Reject Due To

Gross hemolysis OK
Gross lipemia OK
Gross icterus OK

Method Name

PTP: Extraction and Scanning Spectrofluorometry

PFP: High-Performance Liquid Chromatography (HPLC)


If not ordering electronically, complete, print, and send an Inborn Errors of Metabolism Test Request (T798) with the specimen.