Days Set Up
Monday - Friday
Analytic Time

2 - 5 days

MiChart Code
Protein S, Total and Free
Soft Order Code
PSTF

Test Updated:

Synonyms

Protein S Antigen, Free and Total
PROTEIN S ANTIGEN, PLASMA
PSF
PST
PROTEIN S ANTIGEN, FREE
PROTEIN S ANTIGEN, TOTAL

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Find a Requisition

All specimens should be accompanied by a requisition.

Submitting Specimens

Learn about how to properly label and where to ship specimens.

Order Kits and Supplies

MLabs provides all the supplies necessary for the collection of specimens.

Test FAQ

Visit our provider FAQ and learn about common questions to ordering tests.

Test Overview

Test Methodology

Latex Immunoassay

Test Usage

Diagnosis of congenital or acquired protein S deficiency states.

Reference Range

Males: Free 65 - 160%, Total 80 - 160%; Females, age <50 yrs: Free 50 - 160%, Total 70 - 160%; Females, age >=50 yrs: Free 65 - 160%, Total 80 - 160%.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Specimen Requirements

Collection Onsite

Test is not orderable for UMHS patients.

Collection Offsite

Collect specimen in a blue top (citrate 3.2%) tube. Mix by inversion. Specimen should arrive at lab within 3 hours of collection; transport at room temperature. Alternatively, centrifuge, aliquot plasma into a polypropylene plastic vial, and freeze the specimen within 4 hours of collection. Transport frozen specimen on dry ice. Collection of the blood through lines that have been previously flushed with heparin should be avoided. If the blood must be drawn through a VAD (vascular access device), the line should be flushed with 5 mL of saline and the first 5 mL of blood or six dead space volumes of the VAD discarded.

Blue Top Tube
Normal Volume
1 mL plasma
Minimum Volume
0.5 mL plasma

Billing Information

CPT Code
85306
Pro Fee Code
 
LOINC
Z238-6

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Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.