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Ristocetin Cofactor
Test Code30892
CPT Codes
85245<br>Limited Access Code
Preferred Specimen
1 mL platelet-poor plasma collected in 3.2% sodium citrate (light blue-top) tube
Minimum Volume
0.5 mL
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 WBS/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.
Shipping room temp or refrigerated is unacceptable.
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.
Refer to Quest Diagnostics Directory of Services under Specimen Collection section, Coagulation Testing for further information on specimen processing.
Shipping room temp or refrigerated is unacceptable.
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.
Refer to Quest Diagnostics Directory of Services under Specimen Collection section, Coagulation Testing for further information on specimen processing.
Transport Container
Plastic vial
Transport Temperature
Frozen
Specimen Stability
Room temperature: 6 hours
Refrigerated: Unacceptable
Frozen -20°C: 30 days
Frozen -70°C: 1 year
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Thawed plasma received room temperature or refrigerated; Hemolysis; Lipemia
Methodology
Platelet Agglutination
Setup Schedule
Set up: Mon-Fri; Report available: Next day
Reference Range
See Laboratory Report
