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Test Code TLPDF T-Cell Lymphoma, Diagnostic FISH, Varies


Ordering Guidance


This test is intended for instances when a non-specific T-cell lymphoma fluorescence in situ hybridization (FISH) panel is needed.

 

If limited T-cell lymphoma FISH probes are preferred, order TLPMF / T-Cell Lymphoma, Specified FISH, Varies.

 

This test should only be ordered if the sample is known to have a sufficient clonal T-cell population. If a flow cytometry result is available and does not identify a sufficient clonal T-cell population, this test will be canceled, and no charges will be incurred.

 

For testing paraffin-embedded tissue samples from patients with T-lymphoblastic lymphoma (T-BLB), see TLBLF / T-Lymphoblastic Leukemia/Lymphoma, FISH, Tissue.

 

For patients with T-cell acute lymphoblastic leukemia/lymphoma (T-ALL/LBL), order either TALAF / T-Cell Acute Lymphoblastic Leukemia/Lymphoma (ALL), FISH, Adult, Varies. or TALPF / T-Cell Acute Lymphoblastic Leukemia/Lymphoma (T-ALL/LBL), FISH, Pediatric, Varies depending on the age of the patient.



Shipping Instructions


Advise Express Mail or equivalent if not on courier service.



Necessary Information


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.



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: 2-3 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 observed in patients with various T-cell lymphomas using a laboratory-designated probe set algorithm

 

Tracking known chromosome abnormalities and response to therapy in patients with T-cell lymphoma

 

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 3 probe sets (6 individual fluorescence in situ hybridization [FISH] probes). Additional charges will be incurred for all reflex or additional probe sets performed.

 

When this test and flow cytometry testing for leukemia/lymphoma are ordered concurrently, the flow cytometry result will be utilized to determine if sufficient clonal T-cells are available for FISH testing. If the result does not identify a sufficient clonal T-cell population, this FISH test order will be canceled, and no charges will be incurred.

 

 

If FISH testing proceeds, all probes in the initial panel will be performed. The initial panel includes testing for the following abnormalities using the probes listed:

14q32.1 rearrangement, TCL1A break-apart

14q11.2 rearrangement, TRAD break-apart**

i(7q), D7Z1/D7S486

+8, D8Z2/MYC

 

**When a TCL1A rearrangement is not identified and the patient has T-cell prolymphocytic leukemia/lymphoma (T-PLL), reflex testing using the TRAD break-apart probe set will be performed.

 

See Bone Marrow Staging for Known or Suspected Malignant Lymphoma Algorithm, see in Special Instructions.

Method Name

Fluorescence In Situ Hybridization (FISH)

Reporting Name

T-cell Lymphoma B/BM, Diag 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

88271 x6, 88275 x3, 88291 x1- FISH Probe, Analysis, Interpretation; 3 probe set

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

LOINC Code Information

Test ID Test Order Name Order LOINC Value
TLPDF T-cell Lymphoma B/BM, Diag FISH In Process

 

Result ID Test Result Name Result LOINC Value
614337 Result Summary 50397-9
614338 Interpretation 69965-2
614339 Result Table 93356-4
614340 Result 62356-1
GC138 Reason for Referral 42349-1
GC139 Specimen 31208-2
614341 Source 31208-2
614342 Method 85069-3
614343 Additional Information 48767-8
614344 Disclaimer 62364-5
614345 Released By 18771-6