Rapid progress in genomic medicine in recent years has made it possible to diagnose subtle genetic abnormalities in a clinical setting on routine basis. This has allowed for detailed genotypephenotype correlations and the identification of the genetic basis of many congenital anomalies. In addition to the availability of chromosomal microarray analysis, exome and whole genome sequencing on pre-and postnatal samples of cell free DNA has revolutionized the field of prenatal diagnosis. Incorporation of these technologies in perinatal pathology is bound to play a major role in coming years. In this communication, we briefly present the current experience with use of classical chromosome analysis, fluorescence in situ hybridization, and microarray testing, development of whole genome analysis by next generation sequencing technology, offer a detailed review of the history and current status of noninvasive prenatal testing using cell free DNA, and discuss the advents of these new genomic technologies in perinatal medicine.
G-banding chromosome analysisFor several decades, traditional G-banding chromosome analysis has been an integral part of clinical work up of many neonatal deaths, still births, pregnancy losses in the first and second trimester, as well as prenatal diagnosis using amniocentesis and chorionic villus sampling. Approximately 30% of miscarriages result from aneuploidy and at least 0.3% of newborns have numerical chromosome abnormalities, which can be detected by traditional karyotyping 1 . Classical chromosome analysis enables the detection of large genomic alterations (Fig 1A), including triploidy, aneusomy, balanced and unbalanced chromosomal