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CD4 pin

IHC

CD4

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

Organ:

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

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