Pathology

Test & Collection Guide

PLEASE NOTE: Recent changes have been made to this Test

Recent changes for vWF Activty
Date	Field	Changed From	Changed To
8th March 2024	Laboratory	Referred Test	Haematology
	External Laboratory	Austin Pathology
	Frequency	Weekly	Fortnightly

vWF Activty

Ordering information:

vWF Activity

Clincal data should include:

History of bleeding episodes - personal or family

Laboratory:

Haematology

Test Code:

VWFACT

Specimen types:

Plasma

Container types:

Sodium Citrate

Collection Instructions:

Transport specimen at Room Temperature to lab
Samples found to have clots cannot be tested

Do not use 1 ml citrate tubes.

If requested with von Willebrand Factor and Factor VIII collect 2 x 3.5 ml citrate tubes.

Minimum Adult Volume:

8 mL

Notes:

Tests for von Willbrands Factor may be ordered individually however they would usually be order as a panel ( such as FVIII, vWF Antigen and vWF Activity ) along with supporting tests FBE, APTT, INR, PFA100, Blood group. Where applicable addition tests such as vWF Multimers may be required.

Frequency:

Fortnightly

Result Turnaround Time:

2 weeks

Laboratory Use Only

Laboratory Notes:

vWF activity - Eliza type assay ; monoclonal Ab. which recognises a functional epitope on the vWF antigen. vWF Activity is used in place of RiCoF which is a technically difficult test to standardise and has poor precision.

Test & Collection Guide

PLEASE NOTE: Recent changes have been made to this Test

Recent changes for vWF Activty

Date

Field

Changed From

Changed To

Laboratory

External Laboratory

Frequency