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TCL1 (14q32.1)
- FISH
This test uses TCL1 (14q32.1) probes to detect gene abnormalities associated with mature T-cell leukemia, T-cell prolymphocytic leukemia (T-PLL), and adult T-cell leukemia/lymphoma (ATLL).
Specimen Requirements
Bone Marrow Aspirate: 1-2 mL in sodium heparin tube. EDTA tube is acceptable.
Peripheral Blood: 2-5 mL in sodium heparin tube. EDTA tube is acceptable.
Fresh, Unfixed Tissue: Tissue in RPMI.
Fluids: Mix in equal parts with RPMI (specimen volume to RPMI ratio of 1:1).
Fixed Cell Suspension: A client-prepared fixed cell suspension is acceptable if received in 3:1 Methanol:Glacial Acetic Acid.
H&E slide (required) plus paraffin block.
Cut Slides: H&E slide (required) plus 3 unstained slides cut at 4-5 microns.
Note for Tech Only clients: Please circle H&E slide.
Note for NYS clients: Cut slides and paraffin block specimens are not accepted.
Storage and Transportation
Use cold pack for transport, making sure cold pack is not in direct contact with specimen. For fresh samples: refrigerate before shipping and ship same day as drawn whenever possible. Do not freeze. NYS clients please provide date and time of Collection.
CPT Code(s)*
88377x1 manual or 88374x1 automated.
*The CPT codes provided with our test descriptions are based on AMA guidelines and are for informational purposes only. Correct CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed.
Last Updated: August 05, 2025