In many traditional families, many older generations hope that their offspring will have boys, so many parents are eager to know the gender of their children after pregnancy. Although it is prohibited to identify the gender of a fetus in China, there have been many methods for identifying the gender of a fetus that have been widely spread on the internet. The online Tang screening can identify the gender of a fetus, which is both simple and convenient. But is it really the case? Do you know how to determine gender based on Down syndrome screening results?
Down syndrome screening is a detection method that involves extracting serum samples from pregnant women, measuring the concentrations of alpha fetoprotein and chorionic gonadotropin in maternal serum, and calculating the risk factor for giving birth to a Down syndrome baby based on the pregnant woman's due date, age, weight, and gestational age at the time of blood collection.
There are generally two screenings for Down syndrome: early Tang and mid Tang. Early Tang is performed at 11-13 weeks, mainly with an accuracy rate of 90% for NT binding serum testing; The best time for screening at any time during the mid Tang period is between the 15th and 20th week of pregnancy. Generally, pregnant women can receive screening results within one week after blood draw. If the result is high-risk, there is no need to panic, as further amniocentesis and fetal chromosome examination are required to confirm the diagnosis.
To predict fetal gender through Down syndrome screening results, first look at the MOM value of β - hCG. If the MOM value is below 0.4, the vast majority are boys; MOM value above 1.0, the vast majority are girls; Between 0.4 and 1.0 is the critical range, which is possible for both men and women. Secondly, by combining the two values (β - hCG and AFP), the prediction may be more accurate. The lower the MOM value of β - hCG (0.4) and the higher the MOM value of AFP (1), the more likely it is to be a boy; The higher the MOM value of β - hCG (0.8) and the lower the MOM value of AFP (1), the more likely it is to be a girl. In addition, both male and female fetuses with Down syndrome and false positive Down syndrome have higher β - hCG values and lower AFP values.
In fact, among the scientific methods for identifying fetal gender, B-ultrasound and DNA maternal blood screening have the highest safety factor, while amniocentesis has the highest accuracy and the most contraindications before and after surgery. Villial sampling and amniocentesis have the highest risk, and DNA maternal blood screening has the earliest testing cycle. However, non-medical fetal gender testing is not allowed in China. In fact, as parents, both boys and girls are their own children and should be treated fairly. If they are just curious or convenient to prepare baby supplies in advance, then we are very sorry. The Down syndrome screening results may not be accurate based on the gender of the fetus.
