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Also known as: MLL (mixed-lineage leukaemia) FISH

Test category:

Oncology - Leukaemia

Use of test


MLL (also known as KMT2A) is located at 11q23. It can undergo gene fusion with a variety of partner genes in several types of acute leukaemia. This fusion carriers prognostic implications.


Presence of an MLL fusion gene is typically associated with a poor prognosis.

Ethical considerations:

This is an assay for non-heritable mutations. It does not raise issues of ethics or consent that are different from most other investigations ordered in the routine care of a patient.


Fluorescent in situ hybridisation (FISH) analysis, using probes to identify fusion of MLL with various partner genes.

Requesting the test


This test is usually requested by a haematologist or oncologist.

Sample required:

0.5 mL bone marrow in transport media, or 10 mL blood in lithium heparin.

To help ensure the quality of the test, a genetic test should be done with a dedicated sample whenever possible i.e. a sample collected specifically for that test rather than a sample that is used for multiple tests.

We recommend that the patient or another adult check the labelling of request forms and sample tubes.

Turnaround time:

2 business days.


This test has a Medicare rebate which, subject to the requirements of the Medicare descriptor being met, may cover all or part of the cost.


The Medicare details, including descriptor and schedule fee, are listed under MBS item 73314.

Click here for our billing policy.