Sign in →

Test ID TALPF T-Cell Acute Lymphoblastic Leukemia/Lymphoma (ALL), FISH, Pediatric, Varies


Ordering Guidance


This test is only performed on specimens from patients with T-cell acute lymphoblastic leukemia (T-ALL) who are 30 years of age or younger.

This test is intended for instances when the entire T-ALL fluorescence in situ hybridization (FISH) panel is needed for a pediatric patient.

-If this test is ordered on a patient older than 30 years, this test will be canceled and automatically reordered by the laboratory as TALAF/ T-Cell Acute Lymphoblastic Leukemia/Lymphoma, FISH, Adult, Varies.

-If this test is ordered and the laboratory is informed that the patient is on a Children's Oncology Group (COG) protocol, this test will be canceled and automatically reordered by the laboratory as COGTF / T-Cell Acute Lymphoblastic Leukemia/Lymphoma (ALL), Children's Oncology Group Enrollment Testing, FISH, Varies.

 

If limited T-cell ALL FISH probes are preferred, order TALMF / T-Cell Acute Lymphoblastic Leukemia/Lymphoma (ALL), Specified FISH, Varies.

 

At follow-up, conventional cytogenetic studies (CHRBM / Chromosome Analysis, Hematologic Disorders, Bone Marrow) and targeted T-ALL FISH probes can be evaluated based on the abnormalities identified in the diagnostic study. Order TALMF / T-Cell Acute Lymphoblastic Leukemia/Lymphoma (ALL), Specified FISH, Varies and request specific probes or abnormalities.

 

If the patient clinically relapses, a conventional chromosome study is useful to identify cytogenetic changes in the neoplastic clone or the possible emergence of a new therapy-related myeloid clone.

 

For patients with T-cell lymphoma, order TLPDF / T-Cell Lymphoma, Diagnostic FISH, Varies.

 

For testing paraffin-embedded tissue samples from patients with T-cell lymphoblastic lymphoma, order TLBLF / T-Cell Lymphoblastic Leukemia/Lymphoma, FISH, Tissue.



Additional Testing Requirements


At diagnosis, conventional cytogenetic studies (CHRBM / Chromosome Analysis, Hematologic Disorders, Bone Marrow) and this FISH panel should be performed. If there is limited specimen available, only this FISH test will be performed.



Shipping Instructions


Advise Express Mail or equivalent if not on courier service.



Necessary Information


1. A reason for testing and a flow cytometry and/or a bone marrow pathology report should be submitted with each specimen. The laboratory will not reject testing if this information is not provided, but appropriate testing and interpretation may be compromised or delayed. If this information is not provided, an appropriate indication for testing may be entered by Mayo Clinic Laboratories.

 2. If the patient has received an opposite sex bone marrow transplant, note this information on the request.



Specimen Required


Submit only 1 of the following specimens:

 

Preferred

Specimen Type: Bone marrow

Container/Tube:

Preferred: Yellow top (ACD)

Acceptable: Green top (heparin) or lavender top (EDTA)

Specimen Volume: 2 to 3 mL

Collection Instructions:

1. It is preferable to send the first aspirate from the bone marrow collection.

2. Invert several times to mix bone marrow.

 

Acceptable

Specimen Type: Blood

Container/Tube:

Preferred: Yellow top (ACD)

Acceptable: Green top (heparin) or lavender top (EDTA)

Specimen Volume: 6 mL

Collection Instructions: Invert several times to mix blood.


Useful For

Detecting a neoplastic clone associated with the common chromosome abnormalities and classic rearrangements seen in pediatric/young adult patients with T-cell acute lymphoblastic leukemia (T-ALL)

 

An adjunct to conventional chromosome studies in patients with T-ALL

 

Evaluating specimens in which standard cytogenetic analysis is unsuccessful

Testing Algorithm

This test includes a charge for the probe application, analysis, and professional interpretation of results for 9 probe sets (18 individual fluorescence in situ hybridization [FISH] probes). Additional charges will be incurred for all reflex or additional probe sets performed.

 

 

The diagnostic pediatric/young adult T-ALL FISH panel includes testing for the following abnormalities using the FISH probes listed:

+9/9p-, CDKN2A/D9Z1

t(9;22) or ABL1 amplification, ABL1/BCR

11q23 rearrangement, MLL (KMT2A) break-apart

-17/17p-, TP53/D17Z1

t(5;14), TLX3/BCL11B

7q34 rearrangement, TRB break-apart

14q11.2 rearrangement, TRAD break-apart

t(10;11), MLLT10/PICALM

1p33 rearrangement, TAL1/STIL

 

When an MLL (KMT2A) rearrangement is identified, reflex testing will be performed to identify the translocation partner. Probes include identification of:

t(11;19)(q23;p13.3) MLL/MLLT1

t(6;11)(q27;q23) MLLT4(AFDN)/MLL

t(4;11)(q21;q23) AFF1/MLL

t(9;11)(p22;q23) MLLT3/MLL

t(10;11)(p12;q23) MLLT10/MLL

t(11;19)(q23;p13.1) MLL/ELL.

 

When a TRAD rearrangement is identified, reflex testing will be performed to identify the translocation partner. Probes include identification of:

t(11;14)(p15;q11.2) LMO1/TRAD

t(8;14)(q24.1;q11.2) MYC/TRAD

t(10;14)(q24;q11.2) TLX1(HOX11)/TRAD

t(11;14)(p13;q11.2) LMO2/TRAD.

 

When a TRB rearrangement is identified, reflex testing will be performed to identify the translocation partner. Probes include identification of:

t(7;10)(q34;q24) TRB/TLX1

t(7;11)(q34;p15) TRB/LMO1

t(7;11)(q34;p13) TRB/LMO2

t(6;7)(q23;q34) MYB/TRB.

 

In the absence of BCR/ABL1 fusion or apparent episomal amplification of ABL1, when an extra ABL1 signal is identified, reflex testing will be performed using the ABL1 break-apart probe set to evaluate for the presence or absence of an ABL1 rearrangement.

 

For more information See Acute Leukemias of Ambiguous Lineage Testing Algorithm

Method Name

Fluorescence In Situ Hybridization (FISH)

Reporting Name

Pediatric ALL (T-cell), FISH

Specimen Type

Varies

Specimen Minimum Volume

Blood: 2 mL
Bone Marrow: 1 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Varies Ambient (preferred)
  Refrigerated 

Reference Values

An interpretive report will be provided.

Day(s) Performed

Monday through Friday

Report Available

7 to 10 days

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Test Classification

This test was developed, and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the US Food and Drug Administration.

CPT Code Information

88271x18, 88275x9, 88291x1- FISH Probe, Analysis, Interpretation; 9 probe sets

88271x2, 88275x1-FISH Probe, Analysis; each additional probe set (if appropriate)

LOINC Code Information

Test ID Test Order Name Order LOINC Value
TALPF Pediatric ALL (T-cell), FISH In Process

 

Result ID Test Result Name Result LOINC Value
609568 Result Summary 50397-9
609569 Interpretation 69965-2
609570 Result Table 93356-4
609571 Result 62356-1
GC074 Reason for Referral 42349-1
GC075 Specimen 31208-2
609572 Source 31208-2
609573 Method 85069-3
609574 Additional Information 48767-8
609575 Disclaimer 62364-5
609576 Released By 18771-6

NY State Approved

Yes

Reflex Tests

Test ID Reporting Name Available Separately Always Performed
TALPB Probe, Each Additional (TALPF) No, (Bill Only) No

Forms

If not ordering electronically, complete, print, and send a Hematopathology/Cytogenetics Test Request (T726) with the specimen.