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von Willebrand Panel
Test CodeVWFPAN
Alias/See Also
VWF Panel
CPT Codes
85240 85245 85246
Includes
Panel includes: VWF AG, Factor VIII, ristocetin co-factor
Preferred Specimen
Preferred volume:(3) 4.5 ml Sodium citrate tubes
Minimum Volume
(2) 4.5 ml Sodium Citrate (blue top)
Instructions
Collect full sodium citrate tube(s) (blue top). Send to lab immediately. If the specimen needs to be transported, centrifuge the specimen, aliquot the specimen into a separate container, spin again, aliquot the specimen into 2 containers and freeze.
Transport Container
Sodium citrate (blue top)
Transport Temperature
Frozen
Specimen Stability
Specimen must be centrifuged within one hour of collection.
Room Temperature: 4 hours (centrifuged)
Refrigerated: Not acceptable
Frozen: 30 days
Room Temperature: 4 hours (centrifuged)
Refrigerated: Not acceptable
Frozen: 30 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Specimens which are not properly filled do not contain the proper anti-coagulant to blood ratio and are therefore rejected. Hemolyzed and clotted specimens are also unacceptable for testing.
Methodology
Clotting Turbidimetric
Setup Schedule
Set up daily
Report Available
Turn around time: Reports in 24 hours.
