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Alias Names: VWF / Multimeric
Methodology: Westernblot (WB)
Edit Date: 10/29/2010
Performed: Sunday, Wednesday
Released: 3-7 days after setup at PeaceHealth Laboratories’ reference lab.
CPT Code: 85247-90
Specimen Collection Details
Collection: One 4.5 mL light blue top tube (sodium citrate).
Handling: Within one hour of collection centrifuge and separate plasma. Centrifuge plasma again and separate platelet-poor plasma into a plastic vial. Freeze immediately. CRITICAL FROZEN.
Stability: 14 days frozen.
Standard Volume: 2 mL plasma.
Minimum Volume: 1 mL plasma.
Transport: Frozen ond dry ice.
Comments: Useful in differentiating between a normal multimeric pattern, and an abnormal one, where the High Molecular Multimers are missing, such as in type II vWD. It is necessary to test for vWF:Ag as well as a Ristocetin Cofactor at the same time as the multimer analysis if an interpretation of the pattern is needed.
Rejection Criteria: Hemolysis; microclots.

PeaceHealth Laboratories