Ultrasound fetus determination

First, it happens very rarely that doctors recommend to do an ultrasound examination for the sole purpose of identifying the sex of the child. Medical reasons for sex determination include: the possibility of hereditary diseases associated with X-chromosome (e.g., Hemophilia - a disease of blood incoagulability), which affect only boys, a need to identify some genetic conditions, the identifying of twins. Secondly, according to international standards, fetal ultrasound is performed within strictly limited periods. The first of them is 12-13 weeks. Within this period the presence of gross malformations is revealed (absence of limbs, brain, etc.). Next ultrasound examintaion is conducted at 23-25 weeks, when the best visibility of the fetus anatomy organs of the. Finally, the last ultrasound examination is done at full-term pregnancy, when it is appropriate to determine the maturity of the placenta, the amount of amniotic fluid, fetal weight.
The accuracy of identifying the sex of a child depends primarily on the duration of pregnancy and, unfortunately, of the experience of a specialist. Up to 8th week the fetal genitalia are not differentiated. The process of their forming ends by 10th -12ht week of pregnancy. But do not torment the doctor with a standard question «Whom I will have?» at the first ultrasound (at 12-13 week) examination. According to most scientists, the identification of sex of the child is possible only starting with the 15th week of pregnancy. The boy is to detect by the scrotum and penis, girls - in the visualization of the labia majora. One of the errors in the identification of sex of the child is taking a loop of umbilical cord or fetal fingers for the penis. Sometimes the girls in utero have been observed swelling of the labia passing with time, which is mistaken for testicles. There are cases when the fetus «hides» its male pride behind tightly clenched legs and because of his excessive modesty «is called names» a girl.
The optimal time to answer the cherished question - 23-25 weeks of pregnancy. Foetus is quite agile and should the doctor be patient and perseverant during the ultrasound test, the fetus probably will show who it is. In full-term pregnancy (from 37 weeks), the determintion of baby's gender is difficult because of its large size and low mobility.
Sources:
Ultrasound Image Boy Fetus and Girl Fetus Picture<references/>
Ultrasound General<references/>
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