American scientists have confirmed the scientific validity of blood tests performed on pregnant women to learn about the sex of the baby.
Although these tests are already sold in many countries, to find the fetal DNA in the mother’s blood, few studies have been devoted to check whether they worked or not.
U.S. experts examined nearly 6,000 results and concluded they are 98% effective as long as the blood sample is from the seventh week of pregnancy, otherwise it would lose all confidence.
Urine test showed a total lack of scientific validity, while a routine ultrasound shows the sex of the baby just after twelve weeks. (BG)