Von Willebrand factor (VWF)
Synonyms
VWF; VW:Rag, Rag, RiCof
Clinical Indications
Bruising, recurrent severe nose bleeds, menorrhagia,
postoperative bleeding, relevant family history
It is strongly suggested to request a Bleeding disorder screen
instead unless investigating a known case of von Willbrands
disease.
Test includes Von Willbrand factor antigen and activity
levels
Request Form
Request via ICE
Availability
Mon - Fri 09.00 - 16.00
Specific Criteria
Relevant clinical details/ history. Discussion with Consultant
Haematologist may be suggested
Patient Preparation
Patient should ideally be at rest, be bled with minimum statis
and not in acute phase reaction
Turnaround Time
2 weeks
Specimen
Fresh citrated Blood (within 2 hours of collection)
Volume
4.5ml citrated blood
Container
4.5 ml blue citrated bottle
Collection
Clean venepuncture; sample transported to laboratory immediately
after collection
Causes for Rejection
Under-filled, clotted or haemolysed samples
Reference Range
See patient test report