von Willebrand Antigen, Multimeric Analysis

Message
TAKE TUBES TO LAB PROCESSING STAT!

Test Code
VW MULTI (5168)

Quest Code
5168

CPT Codes
85247

Preferred Specimen
1 mL frozen platelet-poor plasma collected in 3.2% sodium citrate (light blue-top) tube

Minimum Volume
0.2 mL

Instructions
Platelet-poor plasma: Centrifuge light blue-top tube for 15 minutes at approximately 1500 g within 60 minutes 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. Plasma must be free of platelets (<10,000/mcL). Freeze immediately and ship on dry ice.

Note: Storage of whole blood at refrigerated temperatures prior to processing may lead to cryoprecipitate formation and falsely low Factor VIII and von Willebrand Factor studies.

Transport Temperature
Frozen

Specimen Stability

Room temperature: Unacceptable
Refrigerated: Unacceptable
Frozen -70° C: 6 months



Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Hemolysis • Thawed plasma received room temperature or refrigerated

Methodology
Electrophoresis

FDA Status
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.

Setup Schedule
Mon-Fri

Report Available
4 to 4 Day(s)

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. VWF Multimeric Analysis is used to assist in categorizing disease subtype.

Performing Laboratory
Quest Diagnostics Nichols Institute
33608 Ortega Highway
San Juan Capistrano, CA 92675




The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.