FISH Study: Neoplastic Interphase D4Z1 (Trisomy 4)

Methodology: 
Interphase nuclei fluorescence in-situ hybridization (FISH) copy number analyses
Performed: 
Monday - Saturday
Reported: 
5 - 12 days
Use: 

This test is used to detect the presence of chromosome 4 copy number changes (e.g. trisomy), which are commonly observed in childhood B-ALL and have prognostic value.

Result: 
Interpretive report
Specimen Requirements: 
  • Bone Marrow Aspirate: Obtain 1 - 2 cc of in a green-top sodium heparin tube and immediately rotate it thoroughly to ensure adequate mixing with the anticoagulant.
  • Bone Marrow Core Biopsy: Deposit samples in a sterile container containing tissue culture medium with antibiotics (RPMI) that have been brought to room temperature before collection.*
  • Peripheral Blood Specimens: Peripheral blood specimens may be submitted in those clinical conditions (i.e. circulating blasts) and/or circumstances (where warranted).
  • Unacceptable Conditions:
    • Frozen specimens
    • Specimens for FISH study only greater than one week old
    • Specimens for concurrent FISH and cytogenetic studies greater than 48 hours old*
    • Formalin, alcohol or paraffin-preserved specimens
  • Stability (collection to initiation of testing):
    • Ambient: 24 - 48 hours*
    • Frozen: Unacceptable

* Cell viability of specimens requiring cell culture may be compromised in specimens more than 48 hours old upon receipt. Refrigeration at 2° - 8° C may assist when a delay is not preventable. Do not freeze or place specimens directly on ice.

Do not freeze or fix samples in any manner contrary to the maintenance of cell viability. Maintain sample sterility; keep all specimens at room temperature; and deliver samples to the laboratory within 24 - 48 hours. Ship specimens at room temperature for overnight delivery.

Reference Values: 

By report; interpretive

CPT Code (s): 
  • 88271
  • 88275
  • 88291
Notes: 

UFHPL Test #: 30135

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