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UW Health SMPH
American Family Children's Hospital

UW Hospital and Clinics Lab Test Directory

Test Name: Von Willebrand Factor Multimers

Test Code(s): VWFMUL / HCVWFMUL

Methodology: Gel Electrophoresis

Testing Site: Testing will be sent to an approved reference laboratory.

Turnaround Time: Routine: 7 - 10 days.


Specimen Requirements

Specimen: Blood

Collection Instructions: Do NOT draw through a line containing heparin. The venipuncture MUST be atraumatic to avoid hemolysis and contamination with tissue factors and platelets. Tube must be allowed to fill completely.  

Collection Container: Preferred: Light blue top (3.2% NaCitrate)

Collection Volume: Preferred: Full 3.5 mL tube
Pediatrics: Pediatric tube filled to fill mark

Sample Analyzed: Plasma

Volume Required: Preferred: 0.5 mL
Pediatrics: 0.2 mL

Specimen Processing: Centrifuge specimen to yield platelet poor plasma (platelet count should be less than 10 K/uL). Separate plasma and transfer to plastic tube or vial. Freeze plasma within 4 hours of collection at -20C or below.  

Specimen Transport: Transport whole blood specimen at room temperature to UWHC Core Laboratory (B4/220) within 4 hours of collection.  See Specimen Processing for instructions if transport criteria are not met.  Transport frozen plasma aliquot on dry ice to UWHC Core Laboratory (B4/220).  
  

Stability: Ambient: 4 hours on spun tube
Refrigerated: 4 hours
Frozen: 30 days


Interpretation

By report.

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