Prenatal genomic testing for ultrasound‐detected fetal structural anomalies

In the presence of a fetal structural anomaly, fetal DNA can be obtained through invasive testing (e.g. amniocentesis and chorionic villus sampling) in order to undertake genomic testing to attempt to uncover a unifying genetic diagnosis. There are number of traditional and more novel genomic tests available, which can identify aneuploidy, chromosomal structural variation and/or sequence variants within genes. The cumulative diagnostic yield of such technologies is approximately 25%, 6% and up to 80% in some cohorts for QF‐PCR/G‐banding karyotype, chromosome microarray and exome sequencing, respectively.