| Test Name: |
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Von Willebrand Factor Multimers
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| Test Code(s): |
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VWFMUL / HCVWFMUL
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| CPT Code(s): |
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85247
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| Methodology: |
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Gel Electrophoresis
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| Testing Site: |
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Testing will be sent to an approved reference laboratory.
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| Turnaround Time: |
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Routine: 7 - 10 days.
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Specimen Requirements
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| Specimen: |
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Blood
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| Collection Instructions: |
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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.
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| Collection Container: |
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Preferred: Light blue top (3.2% NaCitrate)
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| Collection Volume: |
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Preferred: Full 3.5 mL tube
Pediatrics: Pediatric tube filled to fill mark
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| Sample Analyzed: |
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Plasma
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| Volume Required: |
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Preferred: 0.5 mL
Pediatrics: 0.2 mL
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| Specimen Processing: |
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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 -20°C or below.
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| Specimen Transport: |
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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).
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| Stability: |
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Ambient: 4 hours on spun tube
Refrigerated: 4 hours
Frozen: 30 days
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Interpretation
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By report.
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