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Ristocetin Cofactor
MessageCollect a full tube, following standard venipuncture techniques.
Test Code
LAB3626 RCOFA
Alias/See Also
RCOFA
CPT Codes
85245
Includes
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.@BKRCERMSGREFRESH(2302793)@ @BKRCERMSGREFRESH(2302794)@
Instructions
Processing Instructions (Lab use only): 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 immediatelyNote: 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.Minimum Testing Volume: 0.5 mL Platelet poor plasma Transport Temperature: Frozen Stability: Ambient: N/A Refrigerated : N/A Frozen: 30 days Causes for Rejection: Thawed plasma Received at room temperature or Refrigerated Hemolysis Lipemia
Report Available
3-Days
Clinical Significance
1230170659
Last Updated: May 18, 2026