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Department

Haematology

Preferred Sample Type

Von Willebrand Screen
2x 2.7ml

Specimen Transport

Standard transport to laboratory

Sample Processing in Laboratory

Sample should be centrifuged

Sample Preparation

To arrive in laboratory within 4 hours of collection

Turnaround Time

21 days

Sample Stability

8 hours

Von Willebrand Screen

General Information

Von Willebrand screen includes von Willebrand antigen, Factor VIII and Ristocetin co-factor unless the patient is already diagnosed with von Willebrand disease.

Please contact a Consultant Haematologist before requesting this test.

Notes

Samples for any coagulation tests must be filled to a minimum of 90% of the fill line indicated on the sample tube. Any sample filled below this level will be reported as insufficient and a repeat sample will be required

Reference Range

Factor VIII: 57-158%

vWF Ag: 48-175%

vWF Rcof: 47-154%