Imperial Collage Healthcare

Filter by A-Z

FISH analysis for Myelodysplastic Syndromes

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

Conventional chromosome analysis is the gold standard for identification of the common, recurrent chromosome abnormalities in MDS. However, FISH is a useful adjuct to exclude common rearrangements in non-dividing cells and/or subtle rearrangements that could be missed by conventional analysis.

FISH probes commonly applied to MDS samples include, but are not limited to, the following:



8 centromere



Where possible, follow-up samples from patients with abnormal karyotypes are monitored by FISH only, unless frank relapse and/or disease progression are suspected, in which case conventional karyotyping will be performed in the first instance.

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
MDS referrals are treated as routine; 95% should be reported within 21 calendar days according to national guidelines. Please note however that the average turn around for this category in our laboratory is approximately 12 days.


Sample required:

Bone marrow in cytogenetic transport medium (preferred) or lithium heparin is usually the sample of choice. EDTA samples are only suitable in cases requiring FISH only (ie follow-up samples from patients with FISH-detectable abnormalities). If in doubt please use lithium heparin. 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.

Select a test from the list to view more details.