Protein S Activity with Reflex to Protein S Antigen, Total and Free

Test Code

17494X

CPT Codes
85306

Includes

If Protein S Activity is <60% for females or <70% for males, then Protein S Antigen Total and Free will be performed at an additional charge (CPT code(s): 85305, 85306).

Preferred Specimen

2 mL plasma collected in 3.2% sodium citrate (light. blue-top) tube

Minimum Volume

1 mL

Instructions

Draw blood in 3.2% sodium citrate ( light blue-top) tubes, mix gently by inverting 3-4 times. Centrifuge 15 minutes at 1500 g within one hour of collection. Using a plastic pipett, 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 new plastic screw-cap vial(s). Freeze immediately and transport on dry ice.

Transport Temperature

Frozen

Specimen Stability

Room temperature: Unacceptable
Refrigerated: Unacceptable
Frozen: 30 days

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

Hemolysis

Methodology
Clot Detection • Immunotrubidimetric

Setup Schedule

See individual assays

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.