A cell surface-associated protein expressed on a subset of peripheral blood cells, B-lymphocytes, and EBV transformed B-lymphoblastoid cell lines, and a large subset of follicular dendritic cells. It is useful for distinguishing B-cell chronic lymphocytic leukemia/small lymphocytic leukemia from other entities and tends to be strongly coexpressed with CD5 on these B-cells.

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