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von Willebrand Antigen, Multimeric : 5168
Test CodeVWAGQ or 5168
Alias/See Also
Multimeric Analysis, vW Factor Multimeric, vWF, vWF Multimer
CPT Codes
85247
Instructions
Please submit a separate, frozen vial for each special coagulation assay ordered. Draw blood in a light blue-top tube containing 3.2% sodium citrate, mix gently by inverting 3-4 times. Centrifuge 15 minutes at 1500 g within one hour of collection. Using a plastic pipette, remove plasma, taking care to avoid the WBC/platelet buffy layer and place into a plastic vial. Centrifuge a second time and transfer platelet-poor plasma into a new plastic vial(s). Freeze immediately and transport on dry ice
Transport Container
.Preferred Specimen
1 mL frozen platelet-poor plasma collected in a 3.2% sodium citrate (light blue-top) tube
Minimum Volume
0.2 mL
1 mL frozen platelet-poor plasma collected in a 3.2% sodium citrate (light blue-top) tube
Minimum Volume
0.2 mL
Transport Temperature
Frozen.
Specimen Stability
Room temperature: Unacceptable; Refrigerated: Unacceptable; Frozen: 30 days
Methodology
Electrophoresis
Setup Schedule
Monday - Friday
Report Available
4-8 days (From receipt at performing laboratory)
Limitations
This test was developed and its analytical performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by FDA. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.
Reference Range
Normal
Clinical Significance
von Willebrand Disease is the most common hereditary bleeding disorder and it may also be acquired. Von Willebrand Factor (VWF) is critical for normal hemostasis; mediating platelet adhesion to the damaged endothelium and protecting Factor VIII from proteolytic degradation in circulation. VWFMultimeric Analysis is used to assist in categorizing disease subtype.
Performing Laboratory
Quest Diagnostics