PROTEIN S ANTIGEN, FREE

Message

Requires platelet-poor plasma; see Additional Information below for instruction.
Do not thaw and refreeze

Test Code

PRTSF

CPT Codes
85306

Preferred Specimen

1 Blue tube (Sodium Citrate)

Minimum Volume

1 mL platelet-poor plasma
Requires platelet-poor plasma; see Additional Information below for instruction.

Other Acceptable Specimens

None

Instructions

Tube MUST be full for proper whole blood to anticoagulant ratio.
Invert tube "end to end" to prevent clotting.
Requires platelet-poor plasma; see Additional Information below for instruction.

Transport Container

Standard transport tube.

Transport Temperature

Frozen

Specimen Stability

Frozen at -20°C or lower up to 1 month

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

The following conditions will result in a rejected sample:

Serum
EDTA plasma
Clotted or hemolyzed specimens
Refrigerated whole blood
Whole blood greater than 4 hours from time of collection

Methodology
Chromogenic

Setup Schedule

Tuesday and Thursday only

Report Available

Report available the same day tested.

Reference Range

Age	Male	Female
Adult	74-146%	55-124%

Clinical Significance

Recommended test to detect protein S deficiency. Do not order if individual has been on warfarin (Coumadin) therapy in the previous 2-4 weeks.

Performed By
Alverno Laboratories

Performing Laboratory
Alverno Central Lab
NHMC (Hematology, Miscellaneous)

Additional Information
Obtaining A Platelet-Poor Sample
BD Vacutainer Plus Blue Top Volume Guide

Last Updated: August 2, 2024

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.