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.
Test Details
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Discipline:
Haemostasis
Haemostasis
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Specimen Container Adult:
Light blue - sodium citrate x 2
Light blue - sodium citrate x 2
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Specimen Container Paediatric:
Light blue - sodium citrate x 2
Light blue - sodium citrate x 2
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Minimum Volume Adult:
5.4mL
5.4mL
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Minimum Volume Paediatric:
2.6mL
2.6mL
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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.
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Sample Stability:
4 hrs
4 hrs
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Transport Requirements:
Samples should be transported to lab without delay
Samples should be transported to lab without delay
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Freq Analysis:
Weekly
Weekly
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Add On Test:
tnu-tr.bloodsciencesadditions@nhs.net (external)
tnu-tr.bloodsciencesadditions@nhs.net (external)
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Quality Assurance:
UK NEQAS Blood Coagulation
UK NEQAS Blood Coagulation
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Reference Ranges:
See individual tests
See individual tests
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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...
Read MoreA 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:
RVI or Freeman Section Leaders
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Routine Telephone:
RVI: 0191 2820332, Freeman: 0191 2231195
RVI: 0191 2820332, Freeman: 0191 2231195
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Specialist Test:
Yes
Yes
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Specialist Contact Name:
Haematology and Haemostasis Healthcare Scientist
Haematology and Haemostasis Healthcare Scientist
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Specialist Telephone:
0191 2139758
0191 2139758
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Specialist Email:
alison.brown93@nhs.net
alison.brown93@nhs.net