Chromosomal microarrays spotted more fetal abnormalities than current prenatal tests called karyotypes, according to two studies published in the New England Journal of Medicine. One study showed that microarray testing was just as effective as karyotyping in detecting genetic changes linked to birth defects. In the second study, microarrays helped identify the cause of stillbirth in 87% of the cases, compared with 71% with conventional testing.

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