Von Willebrands Screen


Test Information

Test Name

Von Willebrands Screen

Synonyms

VWD Screen; Collagen Binding Assay; Factor VIII Related Antigen; VWF; VWS; VWD; DAVVP challenge

Preferred Specimen

Citrates x 4 & EDTA (Whole blood)

Testing Location

Referral

Turn Around Time

1 week

Forms

View bleeding-questionnaire

Collection Information

Preparation

  • Complete Coagulation (Bleeding) questionnaire except for inpatients, or specific requests by a Haematologist
  • Must reach lab within 7 hours of collection, collect close to Courier time if necessary

Processing Information

Registration Code

VWS

Notes

  • 3x citrates double spun and freeze within 8 hours of collection, referral to Waikato Hospital Laboratory for VW Screening
  • VWS includes: Factor VIII, Collagen Binding CBA, Factor VIII related antigen vWF:Ag, Ristocetin Cofactor (Ricof)
  • 1x citrate & 1x EDTA, process inhouse for CBC and Coagulation Screen
  • If PFA required as confirmed by Haematology, refer to PFA for specimen requirement

Methodology

Interpretations

View Interpretations

Contact Information

alan.neal@pathlab.co.nz

External Referral Information

Referral Location

Waikato Hospital Laboratory

Send Away Transport

Frozen

External Lab Website