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In page Cell-free fetal DNA:

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The analysis of cffDNA from a sample of maternal plasma allows for prenatal sex discernment. Applications of prenatal sex discernment include:

  • Disease testing: Whether the sex of the fetus is male or female allows the determination of the risk of a particular X-linked recessive genetic disorder in a particular pregnancy, especially where the mother is a genetic carrier of the disorder.[1]
  • Preparation, for any sex-dependent aspects of parenting.[citation needed]
  • Sex selection, which after preimplantation genetic diagnosis may be performed by selecting only embryos of the preferred sex, or, after post-implantation methods by performing sex-selective abortion depending on the test result and personal preference.