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Test Catalog

Test ID: PTP    
Porphyrins, Total, Plasma

Specimen Type Describes the specimen type needed for testing


Specimen Required Defines the optimal specimen. This field describes the type of specimen required to perform the test and the preferred volume to complete testing. The volume allows automated processing, fastest throughput and, when indicated, repeat or reflex testing.

Collection Container/Tube:

Preferred: Green top (heparin)

Acceptable: Lavender top (EDTA)

Submission Container/Tube: Amber vial (Supply T192)

Specimen Volume: 3 mL

Collection Instructions:

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

2. Send specimen in amber vial to protect from light.

Additional Information: Include a list of medications the patient is currently taking.

Forms: If not ordering electronically, submit a Biochemical Genetics Request Form (Supply T439) with the specimen.

Specimen Minimum Volume Defines the amount of specimen required to perform an assay once, including instrument and container dead space. Submitting the minimum specimen volume makes it impossible to repeat the test or perform confirmatory or perform reflex testing. In some situations, a minimum specimen volume may result in a QNS (quantity not sufficient) result, requiring a second specimen to be collected.

1 mL

Reject Due To Identifies specimen types and conditions that may cause the specimen to be rejected


Mild OK; Gross OK


Mild OK; Gross OK


Mild OK; Gross OK


Plasma gel tube or specimen not protected from light

Specimen Stability Information Provides a description of the temperatures required to transport a specimen to the laboratory. Alternate acceptable temperature(s) are also included.

Specimen TypeTemperatureTime
PlasmaFrozen14 days