CD25 (IL-2Rα) pin


CD25 (IL-2Rα)

Alternate Test Names:
Alternative test to TRAP

Methodology: IHC

Clinical Significance:
CD25 (IL-2Rα) is a cell surface-associated protein that is the receptor for interleukin-2. CD25 is expressed on a significant subset of activated T cells, and tends to be strongly expressed on the neoplastic T cells of adult T cell leukemia/lymphoma and anaplastic large cell lymphoma. CD25 is also coexpressed on a subset of B cell neoplasms, most notably hairy cell leukemia. Aberrant CD25 expression on mast cells is an important immunophenotypic clue to the diagnosis of systemic mastocytosis.

Subcellular Localization: Membranous


Disease State: Anaplastic Large Cell Lymphoma (Systemic or Cutaneous), Hairy Cell Leukemia, Mastocytosis

CPT Code(s): 88342 or 88341

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

Tech Only