von Willebrand screening

 

Alternative names, keywords

 

Samples required

2x trisodium citrate blood (blue cap, 3.5 mL tube) taken with minimal stasis, filled to the line. Smaller tubes are available for paediatric samples.

Samples must be analysed or processed in the laboratory within 4 hours of venepuncture.

Test indications

Available only after discussion with consultant haematologist.

Reference range

Factor VIIIc (one stage)

see Coagulation factor assays

VW activity

44 - 117%

VW antigen

50 - 140 %

 

Turnaround time

1 month

Enquiries

Haematology (Coagulation)