Additional Information

This package currently assesses both von Willebrand Factor
(vWF) antigenic level and functional attributes. Functional
attributes include an assessment of vWF interaction with platelets
(specific antibody directed against the platelet binding site of vWF), interaction
with collagen (assayed as collagen binding activity), and interaction
with factor VIII (assayed as circulating factor VIII activity,
each of which is also orderable individually if preferred.
If required for diagnosis by the pathologist, send-out testing
for Multimeric Analysis will also be performed. As
appropriate, recommendations for further specialized testing
such as ristocetin-induced platelet aggregation or DNA analysis may
also be made in individual cases, but the performance of such
testing will require additional orders (and in the case of
ristocetin-induced platelet aggregation, a separate blood draw
on the day of testing).

All 3.2% sodium citrate light blue top tubes require a ratio
of 9 parts blood to 1 part anticoagulant (example: a 3.0 mL tube
requires 2.7 mL blood added to 0.3 mL of
anticoagulant).