Ristocetin Co-factor - von Willebrand Factor - RAF - VWF Factor - R:CoF - von Willebrand Factor Activity - VWF
Specimen Collection Requirements
Whole Blood light blue top tube (3.2% Buffered Sodium Citrate)
For detailed specimen collection and handling, see Coagulation Specimen Collection Guidelines. If the patient is on medication, list the medications on the lab requisition. Call Special Coagulation Lab (503) 413-5119 for STAT requests, or minimal volume information.
Due to short stability, whole blood specimen tubes must reach the testing department within 4 hours, otherwise submit frozen plasma aliquots.
If submitting whole blood, transport at ambient temperature (15-25°C) in original unopened tube.
If submitting frozen plasma aliquots, specimens must remain frozen (-20°C) during transport.
Two 2.7 mL whole blood or two 1.0 mL frozen plasma aliquots
One 2.7 mL whole blood or one 1.0 mL frozen plasma aliquot
Whole Blood: Ambient (15-25°C)
Plasma: Frozen (-20°C), aliquots must remain frozen during storage and transport
Clotted samples, samples collected in containers other than 3.2% Buffered Sodium Citrate, tubes filled less than 90%, samples from patients with a Hematocrit greater than 55%, hemolyzed samples due to ex-vivo causes (i.e., difficult draw, poor sample draw), whole blood samples that were frozen before processing
WHOLE BLOOD Ambient: 4 hours. PLASMA: Ambient: 4 hours; Frozen: -20°C 2 weeks, -70°C 6 months
Legacy Laboratory Services
Thursday, January 5, 2017 03:42:10 AM