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CD21 pin



Methodology: IHC

Clinical Significance:
CD21 is a cell surface-associated protein expressed in the follicular dendritic cells (FDCs) of lymphoid tissues, and in tumors derived from FDCs. Disruption of CD21-positive FDC meshworks can be seen in a variety of lymphomas. CD21 is also expressed by a significant subset of B cells, and is the receptor for Epstein-Barr virus. Subcellular Localization: Membranous


Disease State: Angioimmunoblastic T Cell Lymphoma

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