Test Overview
Test Methodology

Saponin permeabilization and direct immunofluorescence using flow cytometric techniques.

Test Usage

Terminal deoxynucleotidyl transferase (TdT) is a DNA polymerase which is recognized as a phenotypic markers for primitive T and B lymphocytes in the hematopoietic system. Measurement of TdT may be an adjunct to the diagnosis of some leukemias and lymphoblastic lymphomas.

Reference Range *

Pathologist interpretation of results provided.

Test Details
Days Set Up
Monday, Wednesday, Friday
Analytic Time

48 hours

Soft Order Code
FLABEL
Synonyms
  • FX FINAL
  • TdT Marker
  • Terminal Deoxynucleotidyl Transferase
  • FC CAN
  • PRELIM
  • FLOW ADD
  • FLOW TDT
  • FC CANCEL
  • FLOW CYTOMETRY ADDENDUM REPORT
  • FLOW FINAL
  • FLOW FINAL
  • FLOW PRELIMINARY
  • FLABEL
  • Generic Flow Test
Laboratory
Flow Cytometry
Section
Flow Cytometry
Specimen Requirements
Collection Instructions

The TdT test will be run at the discretion of the consulting hematopathologist after review of the slides, any available immunophenotypic analysis results, and/or other diagnostic evaluations, using the specimen received for Leukemia/Lymphoma Immunophenotyping.

Additional Information

Test includes pathologist interpretation of results billed as a separate additional charge. This test is not available without interpretation.

Billing
CPT Code
88184, 88185, 88187
Fee Code
23039, 23041
Pro Fee Code
88187.2
NY State Approved
No