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CD4 pin



Methodology: IHC

Clinical Significance:
CD4 is a cell surface-associated protein expressed at relatively high levels in helper T cells, and at lower levels in monocytes. CD4 is also the receptor for HIV. CD4 is aberrantly decreased in a subset of T cell neoplasms, and is commonly expressed in monocytic/histiocytic neoplasms. Subcellular Localization: Membranous


Disease State: Anaplastic Large Cell Lymphoma (Systemic or Cutaneous)

CPT Code(s): 88342 or 88341 (reference only; CPTs may vary)

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