Methodology: IHC

Clinical Significance:
Identifies: von Willebrand factor (often erroneously referred to as "Factor VIII") is synthesized by endothelial cells and stored in the Weibel-Palade granules. von Willebrand factor can be employed as a marker of vascular neoplasms as well as a marker of megakaryocytic differentiation. Subcellular Localization: Cytoplasmic

Organ:

Disease State: Spindle Cell Tumors / Sarcoma Subtyping

CPT Code(s): 88342 or 88341. The CPT codes provided 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 payer being billed.

Turnaround Time: Within 1-2 business days of receipt

Schedule: Monday - Friday

Specimen Requirements:
• Formalin-fixed, paraffin-embedded (FFPE) tissue block or cell block - OR - • 1 unstained slide for each test requested plus 3-4 additional unstained slides cut at 4µm