Imperial Collage Healthcare

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FISH analysis for Chronic Lymphocytic Leukaemia / small lymphocytic leukaemia

Test Background
FISH involves the application of fluorescent DNA probes specific to genes or genetic regions of interest that highlight abnormalities involving these regions.

Clinical Indications

In CLL/SLL, a panel of FISH probes is applied at diagnosis to identify common genetic abnormalities that are known to be strongly associated with prognosis in this disease and may assist in devising the most suitable management strategy.

The CLL FISH panel includes the following probes:

•          13q14(DLEU)/13qter

•          TP53   17p13

•          ATM    11q22

•          Chromosome 12 centromere

In cases of uncertain diagnosis, a probe for IGH may also be applied if it is deemed appropriate.

It may be appropriate to repeat the CLL FISH panel after treatment to assess response or to investigate disease progression.

Reference Range

Sample Required
See notes section

Sample Volume
Samples would not be rejected on the basis of small volume, however, 5 mL is ideal.

Turnaround Time
FISH analysis in CLL/SLL is treated as routine; 95% should be reported within 21 calendar days according to national guidelines. Please note however that the average turn around for CLL FISH in our laboratory is approximately 9 days.


Sample required:

Bone marrow or peripheral blood in cytogenetic transport medium, lithium heparin or EDTA. Samples which are non-sterile, clotted or collected in sodium citrate, fixative or saline are not suitable.

To ensure appropriate analysis and interpretation it is important to provide clear and concise clinical information.

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