False negative results in prenatal aneuploidy invasive testing : two case reports
1.1. Aims: Over the last decade, molecular methods, such as chromosomal microarray and Bacs-On-Beads assay, have been shown to improve the detection rate of chromosomal abnormalities. Nonetheless, conventional cytogenetics methods, such as FISH and karyotyping, are still useful tools and should not be dismissed.
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