The test is actually more useful than just determining the gender of your unborn. It can also be used to detect if the child is at risk for sex-linked disorders like hemophilia and other genetic diseases early on the pregnancy. The accurate results of the prenatal gender test can eliminate the need for undergoing more invasive tests, which are often risky, like amniocentesis. In general, the test using the blood sample of the mother detects the presence of the Y chromosome which indicates very likely that the unborn infant is a boy. Otherwise, the baby’s gender is a girl.
When it comes to the potency of a prenatal gender test, experts have known for a decade that maternal blood does carry fetal DNA, making the blood test reliable. As the weeks of the gestation increases, the concentration of fetal DNA within the mother’s blood also increases. This is why by 20 weeks into pregnancy, the result of the test is considered to be 99% accurate.
Moreover, this kind of test can also help detect if the unborn baby has certain medical conditions affecting one sex more than the other such as the case of congenital adrenal hyperplasia. This disorder affects girls with genitals appearing masculine-like. Once a pregnant woman went through the test and it was known that her baby girl has the disorder, it can be treated earlier to prevent those undesirable effects. This is how important the test is for expectant mothers.