Prenatal microarray


Genome-wide chromosomal microarray (CMA) detects pathogenic copy number variants (pCNV) in 4-10% of prenatal samples (amniotic fluid or chorionic villus samples). CMA may also detect copy number variants of uncertain clinical significance which may require parental follow up testing to aid interpretation. CMA may also detect pCNV which are not associated with the presenting phenotype (incidental findings).

Request a test

When requesting this test please use the referral form provided. Please also refer to any additional information provided for this test. Download the referral form >

Additional information

For additional information please click on the link

Sending address

Rare & Inherited Disease Laboratory
London North Genomic Laboratory Hub
Great Ormond Street Hospital for Children
Levels 4-6 Barclay House
37 Queen Square

Laboratory service


Sample requirements

15mg of chorionic villi or 15-20 ml amniotic fluid in a universal container

Reference range

Not applicable

Turnaround time

14 days


Upon request

Call in advance?

Not required


The Genetics Laboratories provide an extensive range of Cytogenetics and Molecular Genetics diagnostic testing services.

© 2011 Great Ormond Street Hospital for Children NHS Trust