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Protein C Activity
Test CodeLAB489
CPT Codes
85303
Preferred Specimen
Blue sodium citrate
Minimum Volume
0.5 mL (if single test)
Instructions
Platelet-poor plasma: Centrifuge light blue-top tube for 15 minutes at approximately 1500 g within 60 minutes 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. Plasma must be free of platelets (<10,000/mcL). Freeze immediately and ship on dry ice.
Transport Temperature
Frozen
Specimen Stability
Room temperature: Unacceptable
Refrigerated: Unacceptable
Frozen -20° C: 14 days
Frozen -70° C: 1 year
Refrigerated: Unacceptable
Frozen -20° C: 14 days
Frozen -70° C: 1 year
Methodology
Clotting Assay