
This review examined the relationship between low fetal fraction (LFF) in cell-free DNA screening and the risk of fetal chromosomal aberrations. The results showed that LFF was associated with a higher risk of trisomy 13, trisomy 18, monosomy X, and triploidy, but not trisomy 21. LFF was also associated with a higher risk of various other types of fetal chromosomal aberrations. The absolute rates of fetal chromosomal aberrations in women with LFF ranged between 1-2%. The review noted the potential risk of ascertainment bias and heterogeneity in population characteristics or applied technologies across included studies.
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