Methodology
Platelet Agglutination
Synonyms
RcoF; von Willebrand Factor Activity
Specimen Type
Plasma
Performing Lab
Quest Diagnostics San Juan Capistrano
Epic ID
LAB01048
Lab Test Days
Monday-Friday
Standard TAT
2-5 Days
Collection Information
Specimen Required
(one) 1.8 mL or (one) 2.7 mL Blood
Container Type
Light Blue (Sodium Citrate)
Processing Information - Lab Use Only
Transport Temperature
Frozen-Only
Specimen Stability
Room Temp: 6 Hours; Refrigerated: Unacceptable; Frozen: 30 Days
Rejection Criteria
Hemolysis; Lipemia; Received room temp; Received Refrigerated
Test Volume Required
1 mL Platelet Poor Plasma
Minimum Test Volume
0.5 mL Platelet Poor Plasma
Processing Instructions
Platelet-poor plasma: Centrifuge light blue-top tube for 15 minutes at approximately 1500 g withing 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 freee of platelets(<10,000/mcL). Freeze immediatley.
Comments
Note: Storage of whole blood at refrigerated temperatures prior to processing may lead to cryopreciptiate formation and falsely low Factor VIII and von Willebrand Factor studies.
CPT Codes
85245
Revised
06-16-19
Initials
SL