Protein S Antigen, Total and Free

What it measures

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

Specimen

Specimen

1 mL frozen plasma collected in a 3.2% sodium citrate (light blue-top) tube

Minimum volume

0.5 mL

Container

Transport tube

Temperature

Frozen

Draw blood in blue-top tube containing 3.2% sodium citrate, mix gently by inverting 5-10 times. Centrifuge 15 minutes at 2500-3500 RPM. 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. Plasma must be free of platelets (Freeze immediately and ship on dry ice.

Billing

CPT 85305, 85306