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Test & Collection Guide

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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 CitrateSodium 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.