Methodology: IHC

Clinical Significance:
CD34 is a transmembrane sialomucin expressed in lymphohematopoietic stem and progenitor cells, as well as endothelial cells. It is also a marker of a unique subset of mesenchymal tumors (e.g., solitary fibrous tumor, dermatofibrosarcoma protuberans, epithelioid sarcoma, gastrointestinal stromal tumor, etc.). Subcellular Localization: Membranous

Organ: Skin & Mucosa

Disease State: Large Cell Undifferentiated Malignant Neoplams

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