Newcastle Laboratories

von Willebrand Screen

Clinical Background:

A von Willebrand Screen (VWS) consists of a range of tests designed to assess activity of the various functions of von Willebrand Factor in plasma. Factor VIII, vW Activity and vW Antigen, along wi...

A von Willebrand Screen (VWS) consists of a range of tests designed to assess activity of the various functions of von Willebrand Factor in plasma. Factor VIII, vW Activity and vW Antigen, along with vW associated platelet function and vW multimeric analysis may all be performed.

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Test Details

  • Discipline:

    Haemostasis

    Haemostasis

  • Specimen Container Adult:

    Light blue - sodium citrate x 2

    Light blue - sodium citrate x 2

  • Specimen Container Paediatric:

    Light blue - sodium citrate x 2

    Light blue - sodium citrate x 2

  • Minimum Volume Adult:

    5.4mL

    5.4mL

  • Minimum Volume Paediatric:

    2.6mL

    2.6mL

  • Special Requirement:

    Tubes must be correctly filled to line, to ensure correct ratio of blood to anticoagulant, ensure adequate mixing.

    Tubes must be correctly filled to line, to ensure correct ratio of blood to anticoagulant, ensure adequate mixing.

  • Sample Stability:

    4 hrs

    4 hrs

  • Transport Requirements:

    Samples should be transported to lab without delay

    Samples should be transported to lab without delay

  • Freq Analysis:

    Weekly

    Weekly

  • Add On Test:

    All urgent add ons via telephone on 0191 28 24718, and must be confirmed via email to the appropriate email address

    tnu-tr.bloodsciencesadditions@nhs.net (internal)

    tnu-tr.bloodsciencesadditions@nh...

    All urgent add ons via telephone on 0191 28 24718, and must be confirmed via email to the appropriate email address

    tnu-tr.bloodsciencesadditions@nhs.net (internal)

    tnu-tr.bloodsciencesadditions@nhs.net (external)

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  • Quality Assurance:

    UK NEQAS Blood Coagulation

    UK NEQAS Blood Coagulation

  • Reference Ranges:

    See individual tests

    See individual tests

  • Other Info:

    A screen of tests aimed at diagnosis of von Willebrand Disease. Screen currently consists of:

    Coagulation Screen

    Factor VIII Assay

    von Willebrand factor antigen

    Ristocetin co-factor

    Platelet aggreg...

    A screen of tests aimed at diagnosis of von Willebrand Disease. Screen currently consists of:

    Coagulation Screen

    Factor VIII Assay

    von Willebrand factor antigen

    Ristocetin co-factor

    Platelet aggregation using ristocetin

    vW multimeric structure

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  • Routine Contact Name:

    Peter Strong

  • Routine Telephone:

    0191 282 0332

    0191 282 0332

  • Routine Email:

    p.strong@nhs.net

  • Specialist Test:

    Yes

    Yes

  • Specialist Contact Name:

    Haematology/Haemostasis Health care Scientist

    Haematology/Haemostasis Health care Scientist

  • Specialist Telephone:

    0191 213 9758

    0191 213 9758

Availability:

All testing performed at RVI Haematology laboratory and available during routine hours, Monday to Friday. Testing is usually performed on a weekly basis, depending on batch size availability.

Turn Around:

Usually within 7 days

Send To:

Department of Blood Sciences

Level 3
Leazes Wing
Royal Victoria Infirmary
Queen Victoria Road
Newcastle upon Tyne
NE1 4LP

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