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CD19 pin



Methodology: IHC

Clinical Significance:
CD19, like the CD79 complex and cytoplasmic CD22, is a pan-B-lineage antigen that is first expressed in very early B-lymphoid progenitors, and continues to be expressed at variable levels through terminal B-lymphoid differentiation in plasma cells. With the exception of true plasma cell neoplasms and classical Hodgkin lymphoma, the great majority of mature and immature B-lymphoid neoplasms express CD19. Some neoplasms such as hairy cell leukemia overexpress CD19, while others such as follicular lymphoma typically underexpress CD19. Rare non-B-lymphoid neoplasms express CD19, most notably acute myeloid leukemia (AML) bearing the t(8;21). Subcellular Localization: Mainly membranous; partially cytoplasmic

Organ: Blood/Bone Marrow

Disease State: B Cell Non-Hodgkin Lymphoma (not otherwise classified)

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