Test Catalog

Test ID: PTP    
Porphyrins, Total, Plasma

Useful For Suggests clinical disorders or settings where the test may be helpful

Monitoring treatment of patients with porphyria cutanea tarda

Genetics Test Information Provides information that may help with selection of the correct genetic test or proper submission of the test request

Plasma specimens from patients with active porphyria cutanea tarda, congenital erythropoietic porphyria, and erythropoietic protoporphyria may exhibit increased plasma porphyrin levels. However, a definitive diagnosis cannot be made by plasma analysis alone.


Plasma porphyrins are most appropriate for monitoring patients being treated for porphyria cutanea tarda.


Analysis of plasma porphyrins is suitable for individuals with bullous dermatosis who are in chronic renal failure and unable to provide a urine specimen.

Reflex Tests Lists tests that may or may not be performed, at an additional charge, depending on the result and interpretation of the initial tests.

Test IDReporting NameAvailable SeparatelyAlways Performed
PFPPorphyrins, Fractionation, PNoNo

Testing Algorithm Delineates situations when tests are added to the initial order. This includes reflex and additional tests.

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

Special Instructions Library of PDFs including pertinent information and forms related to the test

Method Name A short description of the method used to perform the test

PTP: Extraction and Scanning Spectrofluorometry

PFP: High-Performance Liquid Chromatography (HPLC)

NY State Available Indicates the status of NY State approval and if the test is orderable for NY State clients.


Reporting Name Lists a shorter or abbreviated version of the Published Name for a test

Porphyrins, Total, P

Aliases Lists additional common names for a test, as an aid in searching

Congenital Erythropoietic Porphyria (CEP)
Erythropoietic Protoporphyria (EPP)
Porphyria Cutanea Tarda (PCT)
Variegate Porphyria
X-linked Dominant Protoporphyria (XLDPP or XDP)