Neonatal and paediatric genomics includes the diagnosis of neonatal land childhood onset rare diseases and the investigation of developmental delay, intellectual disability and autism.

A range of genome-wide and targeted cytogenetic and molecular tests are available depending on the clinical indications for testing.

Neonatal and paediatric genetics

Chromosome microarray (also known as molecular karyotyping) is the gold standard for the diagnostic investigation of autism spectrum disorder, learning difficulty, developmental delay and where there are clinical indications of congenital anomalies. This is an advanced genome-wide investigation used to detect sub-microscopic detect loss and/or gain of DNA that are associated with microdeletion and microduplication syndromes but are not readily detectable by conventional karyotype and/or fluorescence in-situ hybridisation (FISH).

Test NameChromosomal Microarray- Blood
Clinical IndicationFor the first line investigation of intellectual disability, developmental delay, autism, or in the presence of at least two congenital abnormalities.
MethodChromosomal Microarray
Turn around time4 -6 weeks
Medicare Eligibility73292– Criteria applies
Sample TypeBlood
Collection TypeBlood: 6mL in EDTA tube
Newborn to 12 months: 1mL in paediatric EDTA tube
Special InstructionsRequest ‘Chromosomal Microarray’ on referral form. Clinical details required.

Fragile X syndrome (FXS) is an X-linked inherited disorder characterised by developmental delay and intellectual disability. Testing confirms the diagnosis in affected children and can also be offered to other family members who may be at risk of developing FMR1 disorders (late-onset ataxia or primary ovarian insufficiency) or having children with FXS.

Test NameFragile X
Clinical Indication1. For the investigation of intellectual disability, developmental delay, autism, late-onset ataxia, neurodegeneration or premature ovarian failure.
2. Risk assessment of a relative of a person with an FMR1 mutation
MethodPCR Fragment Sizing
Turn around time2 weeks
Medicare Eligibility73300 – criteria apply
Sample TypeBlood
Collection Type10mL EDTA tube
Special InstructionsNone

Conventional chromosome testing is the applicable for the investigation of syndromes such as Down syndrome, Turner Syndrome and reproductive health.

Conventional cytogenetic analysis involves the analysis of the whole genome at the cellular level to detect large genomic changes and chromosomal rearrangements. This test involves culturing white blood cells to produce metaphase spreads of chromosomes, from which slides are prepared and representative cells are captured into digital images.

Test NameChromosomes Blood
Clinical IndicationFor investigation of:
1. For the investigation of Down and Turner Syndrome
2. Follow up testing by conventional analysis
3. Parental and family studies
Gene(s)All Chromosomes
MethodConventional chromosome analysis
Turn around time35 days
Medicare Eligibility73289
Sample TypeBlood
Collection Type10mL Lithium Heparin; For Difficult/Paediatric Collect: Min 1mL
Special InstructionsTransport cooled or at room temperature

Fluorescence in-situ hybridisation (FISH) can be used to confirm the diagnosis of specific chromosomal syndromes due to aneuploidies and microdeletions. Available tests are listed below.

The suspected clinical condition for which testing is being sought must be included on the request form.

Test NameRapid FISH for neonatal diagnosis of aneuploidy
Clinical IndicationFor neonatal diagnosis of suspected chromosomal syndromes
Gene(s)Chromosomes X and 21
Turn around time2 days
Medicare Eligibility73291
Sample TypeBlood Paediatric Collect
Collection TypeMin 1mL in 1 x Lithium heparin tube
Special InstructionsNo additional sample required. Test is performedwith chromosome analysis

FISH for diagnosis of microdeletion syndromes

Syndrome/IndicationChromosome locationGene
1p36 microdeletion1p telomere/1p36Genes at 1p36
WOLF-HIRSCHHORN4p16.3Genes at 4p
Cri du Chat5p15.2EGR1
Prader Willi15q11-q13Genes at 15q11.2-q13
Angelman15q11-q13Genes at 15q11.2-q14
Di George/VCFS22q11.2Genes at 22q11.2
22q microdeletion syndrome22q13.3Genes at 22q13
X inactivationXq13.2XIST
Xp Yp deletionsXp and YpSHOX
Yp rearrangementsYp11.3SRY
ACRO P = Acrocentric p-armsAll sub-telomere probes 
All chromosomesp-arms acrocentrics 
All chromosomesWhole chromosome paints 

Leading the way to improved health

Our dedicated team are committed to ensuring the best quality
results in the shortest turnaround time.