Protein S Activity, Antigen, Total and Free

What it measures

• Protein S, ActivityLOINC 27822-6
• Protein S Antigen, TotalLOINC 27823-4
• Protein S Antigen, FreeLOINC 27821-8

Specimen

Specimen

1 mL plasma collected in each of two 3.2 % separate sodium citrate (light blue-top) tubes

Minimum volume

0.5 mL per specimen

Container

Transport tube(s)

Temperature

Frozen

Please submit a separate, frozen vial for each special coagulation assay ordered. 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. 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). Freeze immediately and transport on dry ice.

Billing

CPT 85305, 85306