Methodology
Immunohistochemistry (IHC)
Test Description
Annexin A1 (ANXA1), a gene related to phagocytosis, is found to be one of the most highly upregulated genes in hairy cell leukemia. Annexin A1 is strongly expressed on the cell membrane of 97% of hairy cell leukemia cases. Although Annexin A1 is negative in normal B-cells or B-cell tumors other than "classic" hairy cell leukemia, it stains myeloid cells, macrophages, and subsets of benign T-cells.
Specimen Requirements
- A formalin-fixed, paraffin-embedded (FFPE) tissue block is preferred specimen type
or - One (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 ordered
- Block and slide identifiers should be clearly written and match exactly with the specimen ID and specimen labeling as noted on the requisition.
Storage & Transportation
Use cold pack for transport. Make sure cold pack is not in direct contact with specimen.
CPT Code(s)*
88342 x 1 or 88341 x 1
Turnaround Time
24 hours
Level of Service
Stain Only
New York Approved
Yes