A cell surface-associated protein expressed on cortical thymocytes, Langerhans cells, and dendritic cells. It is expressed at the "dual-positive" stage of T cell development and on a subset of precursor T lymphoblastic leukemias/lymphomas corresponding to this stage of T cell development. While it is absent on mature peripheral blood T-cells, it is detected on activated T-lymphocytes.

Turnaround Time
24 hrs
Specimen Requirements

A formalin-fixed, paraffin-embedded (FFPE) tissue block is preferred specimen typeorOne (1) unbaked, unstained slide for H&E staining (required) and two to three (2-3) positively charged unstained slides (all cut at 4-5 microns) for each test/antibody orderedBlock and slide identifiers should be clearly written and match exactly with the specimen ID and specimen labeling as noted on the requisition.

Storage and Transportation

Use cold pack for transport. Make sure cold pack is not in direct contact with specimen.

CPT Codes
88342 x 1 or 88341 x 1