Test Directory

TCF3-PBX1 t(1;19)(q23;p13) Diagnostic (ALL)

Containers - Adult

Red Cap Tube EDTA KE 9ml
Volume Range

​10-15ml Peripheral blood or Bone marrow specimen

Additive per Container


Laboratory Site

Crewe Road South
Telephone: 0131 537 1000

Transport arrangements

Blood and bone marrow specimens should ideally arrive within 24 hours of collection (maximum of 48 hours).  Specimens should arrive no later than 3.30pm on Friday.  Samples should be sent to the following address:

Western General Hospital

Haematology/Biochemistry Combined Reception

Immunophenotyping Laboratory

Crewe Road


EH4 2XU​


See also Specimen transportation.

Sample storage arrangements

Samples should be stored at room temperature. See specimen requirements.​

Special instructions for collection


How to request

Please refer to our detailed requestinginstructions.  The HMDS request form can be located here.​ 


Testing may be performed by reflex from immunophenotyping.


Monday-Friday 9am-5pm

Anticipated turnaround

​Results for diagnostic samples should be expected within 3 working days.  See results.

What happens if the result is positive or abnormal

The requesting clinician will be contacted where results are clinically significant. Please ensure details are included on request form.

Static information/disclaimer

TCF3-PBX1 fusion gene testing is performed on all patients <70 years old diagnosed with ALL based on immunophenotyping results via a reflex testing strategy. 

Please see TCF3-PBX1 MRD monitoring for follow up samples.

General additional information

​The TCF3-PBX1 fusion oncogene arises as a result of the t(1;19)(q23;p13) translocation. It is observed in approximately 6% of paediatric B-ALL but is less common in adults.

TCF3-PBX1 fusion gene analysis is carried out as part of the ALL testing panel, which also includes BCR-ABL1, ETV6-RUNX1 and KMT2A fusion gene analysis.

This test is accredited to ISO 15189:2012

For clinical advice on appropriate investigations and advice for the interpretation of test results, please contact us​.