FISH, PDGFRB, 5q33.1

Test Code

90510

CPT Codes
88271 (x2), 88275

Preferred Specimen

3 mL bone marrow or 5 mL whole blood collected in a sodium heparin (green-top) tube

Minimum Volume

1 mL bone marrow • 3 mL whole blood

Other Acceptable Specimens

Bone marrow collected in: Transport medium, sodium heparin (royal blue-top) tube, or sodium heparin lead free (tan-top) tube • Whole blood collected in: Sodium heparin (royal blue-top) tube or sodium heparin lead free (tan-top) tube • 5x5 mm fresh tumor tissue in transport medium • 5x5 mm tumor tissue in formalin-fixed paraffin-embedded tissue block

Instructions

1-3 mL bone marrow in transport medium or 3-5 mL whole blood in a sodium heparin tube (green top, dark/royal blue top, tan top).
Formalin fixed paraffin embedded tumor biopsy or 5 mm x 5 mm fresh tumor biopsy in transport medium.

Transport Temperature

Room temperature

Specimen Stability

Specimen viability decreases during transit. Send specimen to testing lab for viability determination. Do not freeze. Do not reject.

Methodology
Fluorescence in situ Hybridization (FISH)

FDA Status
This test was developed and its analytical performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by FDA. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.

Setup Schedule

Set up: Daily; Report available: 5-7 days

Clinical Significance

FISH testing with the PDGFRB probe allows detection of translocations involving PDGFRB and another chromosome region (usually a tyrosine kinase coding gene). Fusion of PDGFRB with a tyrosine kinase coding gene leads to kinase activation.

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.