von Willebrand Panel

Message
*Take to processing ASAP.


Test Code
91242


Alias/See Also
LAB1112


CPT Codes
85240, 85246, 85245, 85730

Includes
Factor VIII Activity, Clotting
von Willebrand Factor Antigen
Ristocetin Cofactor
Partial Thromboplastin Time, Activated


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


Minimum Volume
1.8 mL


Transport Container
Transport tube


Transport Temperature
Frozen


Specimen Stability
Room temperature: Unacceptable
Refrigerated: Unacceptable
Frozen: 14 days


Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Hemolysis • Lipemia


Methodology
Immunoturbidimetric Assay • Photometric Clot Detection • Photo-Optical Clot Detection • Platelet Agglutination

Reference Range
See individual tests


Clinical Significance
von Willebrand disease is the most common bleeding disorder. The diagnosis can only be assured by performing a multiplicity of tests to confirm the diagnosis, and to distinguish type 1, type 2, and type 3 disease types which require different treatment programs. It is essential to measure FVIII activity along with vWF Antigen, Functional vWF Activity by Ristocetin Cofactor and measure Multimeric analysis of von Willebrand Protein to characterize intermediate and high weight forms.


Performing Laboratory
Quest Diagnostics Nichols Institute-San Juan Capistrano, CA
33608 Ortega Highway
San Juan Capistrano, CA 92675-2042




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.