Days Set Up
Monday - Thursday
Analytic Time

3 - 10 days

MiChart Code
Biliary Tract Malignancy by FISH
Soft Order Code

Test Updated:



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Test Overview

Test Methodology

Fluorescence In Situ Hybridization (FISH)

Test Usage

This test detects aneuploidy of chromosomes 3, 7, and 17 via fluorescence in situ hybridization (FISH) in bile duct brushing and aspirate specimens. Detection of chromosomal gains is associated with malignancy. As an adjunct to conventional cytology this test may be useful in the assessment of pancreatobiliary strictures for malignancy.

Reference Range

Interpretive report provided.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Specimen Requirements


Obtain bile duct brushing or aspirate. Place brush directly into a ThinPrep (Non-Gyn) or conical tube containing CytoLyt solution, swirl the brush vigorously in the solution, then snip into the container, or place aspirate specimen into CytoLyt container. Refrigerate.

Minimum Volume

Billing Information

CPT Code
Pro Fee Code

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Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.