During pregnancy, a small part of the fetus's DNA is circulating in the mother's blood, which allows the analysis to be carried out without the need to obtain samples from the fetus.
This test looks at the baby's DNA circulating in the mother's blood. In the free fetal DNA (ffDNA) using genetic analysis techniques and the male genes (Y chromosome) are searched for, if they are found, the baby is a boy and if they are not found, it is a girl. This can be known because in a boy the karyotype is XY and in the girl XX, so the presence of the Y chromosome indicates the presence of a male.
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