Clinical background:
The quantitation of Von Willebrand Factor Antigen is required for the typing of von Willebrand disease. Type 2 vWD have a much lower antigen compared to function and this has implications for treatment and monitoring
Specimen container paediatric:
Light blue – sodium citrate
Specimen container adult:
Light blue – sodium citrate
Minimum volume paediatric:
2.6mL
Minimum volume adult:
5.4mL
Special requirements:
Tube must be correctly filled to line, to ensure correct ratio of blood to anticoagulant, ensure adequate mixing.
Sample stability:
4 hrs
Transport requirements:
Samples should be transported to lab without delay
Availability:
All testing performed at RVI Haematology laboratory and available during routine hours, Monday to Friday. Testing is usually performed on a weekly basis, depending on batch size availability.
Freq analysis:
Continuous
Add on test:
[email protected] (external)
Quality assurance:
UK NEQAS Blood Coagulation
Reference ranges:
40 to 150 IU/dL
Note: For Haemostatic tests, paediatric reference ranges may be different to adult ranges.
Other info:
Plasma von Willebrand factor concentration.Performed as part of a vW Screen.