Protein S Antigen, Total and Free

Message

Draw blood in a light blue-top tube containing 3. 2% sodium citrate, mix gently by inverting 3-4 times. Centrifuge 15 minutes at 1500 g within one hour of collection.

Test Code

LAB760 PRSTF

Alias/See Also

PRSTF

CPT Codes
85305| 85306

Includes

@BKRCERMSGREFRESH(2302793)@ @BKRCERMSGREFRESH(2302794)@

Instructions

Using a plastic pipette, remove plasma, taking care to avoid the WBC/platelet buffy layer and place into a plastic vial. Centrifuge a second time and transfer platelet-poor plasma into a new plastic vial(s). Plasma must be free of platelets (<10,000/mcL). Freeze immediately and transport on dry ice.Minimum Testing Volume: 1 mL Transport Temperature: Frozen Stability: Ambient: N/A Refrigerated : N/A Frozen: 30 days Causes for Rejection: Hemolysis

Report Available

6-Days

Clinical Significance

1230170560

Last Updated: May 18, 2026

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.