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VON WILLEBRAND FACTOR ACTIV (RCF)

Test Number:
  • 6656
Test Alias:
Preferred Specimen:
  • Plasma
Container Type:
  • Citrate Blue Top
Alternative Specimen:
Volume:
  • Minimum 1 mL, Preferred 2 mL
Collection Instructions:
  • Fasting for at least 8 hours is preferred.

    Collection instructions: 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. 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.

Transport Temperature:
  • Critical frozen
Specimen Stability:
  • Room temperature: 6 hours
  • Refrigerated: Unacceptable
  • Frozen: 30 days
Methodology:
  • Platelet Agglutination
CPT Code:
  • 85245
Reject Criteria:
Reference Range:
  • 42-200 % normal
Report Available:
  • 8 days

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