Von Willebrand Factor activity assay | KK Women's and Children's Hospital

Specimen Container	Sodium Citrate Tube
Specimen Requirement	Citrated Whole Blood Adult: 3 mL Paediatric: 1 mL
Specimen Storage/Transport	Requires urgent specimen transportation to SGH laboratory.
Orderable as Urgent?	No
Turn Around Time	1 week
Reference Value(s)	50 - 187%
Testing Laboratory Location	SGH
Laboratory	Haematology
Contact Number	6394 1352
Day and Time Performed	Weekly
Orderable on CPOE?	Yes
Downtime Form	63170-Form-1080 Haematology Laboratory Downtime Form
Additional Information	Fill blood up to the black marking on tube and mix well. Overfilling of blood may cause clotting. Under filling cause dilution of clotting factors. Test for Von-Willebrand factor antigen is recommended in conjunction with the above test.

Change History Notes

08 Feb 2023 12:00 AM

Updated Laboratory.
06 Nov 2021 12:00 AM

Updated Test Name, Specimen Requirement, Reference Value(s).

Last Updated - 24 Jul 2025