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Identifies cell surface-associated protein expressed at relatively high levels by cytotoxic/suppressor T cells (which express the alpha-beta heterodimer of CD8), and at lower levels by gamma-delta T cells and natural killer cells (both of which express the alpha-alpha homodimer of CD8). CD8 is aberrantly decreased in a subset of T cell and NK cell neoplasms.
Subcellular Localization: Membranous
CPT Code(s): 88342 or 88341 (reference only; CPTs may vary)
Turnaround Time: Within 1-2 business days of receipt
Schedule: Monday - Friday
• 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