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PLEASE NOTE: Recent changes have been made to this Test

Recent changes for Von Willebrand Factor Antigen

Recent changes for Von Willebrand Factor Antigen
Date	Field	Changed From	Changed To
24th January 2024	Preferred Container Type	Sodium Citrate	Sodium Citrate x 4
	Collection & Request Instructions	4 CITRATE REQUIRED. Usually ordered as part of von Willebrand factor (vWF) studies, which include von Willebrand factor antigen (vWF Ag), FVIII and Ristocetin (RicoF). If no other tests in vWF studies are ordered, contact request doctor to confirm that no other tests are required.	4 CITRATE REQUIRED. Usually ordered as part of von Willebrand factor (vWF) studies, which include von Willebrand factor antigen (vWF Ag), FVIII and Ristocetin (RicoF). If no other tests in vWF studies are ordered, contact request doctor to confirm that no other tests are required.

Date

Field

Changed From

Changed To

24th January 2024

Preferred Container Type

Sodium Citrate

Sodium Citrate x 4

Collection & Request Instructions

4 CITRATE REQUIRED. Usually ordered as part of von Willebrand factor (vWF) studies, which include von Willebrand factor antigen (vWF Ag), FVIII and Ristocetin (RicoF).

If no other tests in vWF studies are ordered, contact request doctor to confirm that no other tests are required.

4 CITRATE REQUIRED. Usually ordered as part of von Willebrand factor (vWF) studies, which include von Willebrand factor antigen (vWF Ag), FVIII and Ristocetin (RicoF).

If no other tests in vWF studies are ordered, contact request doctor to confirm that no other tests are required.

Von Willebrand Factor Antigen

Alternative Names:

von Willebrand factor
vWF Ag
von Willebrand factor studies

Laboratory:

Haematology

Test Code:

VWA, VWR, F8

Registration Instructions:

VWA, VWR, F8 TO BE CODED

Specimen Types:

Plasma

Container Types:

Sodium Citrate x 4

Adults Volume or Mass:

2.7 mL

Minimum/Paediatric Volume or Mass:

1.7 mL

Collection & Request Instructions:

Retrospective testing within 6 hours

4 CITRATE REQUIRED. Usually ordered as part of von Willebrand factor (vWF) studies, which include von Willebrand factor antigen (vWF Ag), FVIII and Ristocetin (RicoF).

If no other tests in vWF studies are ordered, contact request doctor to confirm that no other tests are required.

Transport Instructions:

Room Temperature

Processing Instructions:

Centrifuge immediately.

If a tube is collected for vWF RiCoF, this tube needs to be centrifuged twice.

Aliquot all 4 citrate tubes into 4 labelled aliquot tubes and store at -80C.

Assay Frequency:

Weekly