Free and Protein S Antigen

Panels that include this biomarker

• Venous Thrombosis Hypercoagulability Panel with Reflex and Consultation 19656

  12 analytes · Serum · Fasting not stated

  Method and collection

  Method

  See individual tests

  Collection

  Whole blood sample is for the Factor V Mutation Analysis and Prothrombin (Factor II) Mutation Analysis. Serum sample is for the Homocysteine. Red-top tubes: Place the specimen in a refrigerator or ice bath for 30 minutes after collection. Centrifuge the specimen as soon as possible after complete clot formation has taken place. Transfer the serum to a plastic screw-capped vial. Barrier gel separator tubes: Place the specimen in a refrigerator for 30 minutes after collection. Centrifuge the specimen as soon as possible after complete clot formation has taken place. Do not place barrier tubes in an ice bath as freezing may prevent the barrier gel from adequately separating serum from cells. Platelet-poor plasma is for the remaining tests. Platelet-poor plasma: Centrifuge light blue-top tube 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 six new plastic vials. Plasma must be free of platelets (<10,000/mcL). Freeze immediately and ship on dry ice. Note: Storage of whole blood at refrigerated temperatures prior to processing may lead to cryoprecipitate formation and falsely low Factor VIII and von Willebrand Factor studies.

  Reference notes

  See Laboratory Report

  Quest Diagnostics catalog page

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