During the ultrasound procedurethe doctor maintains a special protocol. In it, he brings all the information about the growth and development of the baby. One of the most important indicators of the protocol is the biparietal size of the head. In this article, we will talk about what a fetus BDP is for a week and for which it is necessary to know about it during pregnancy.
Indicator value
The brain is the most important organ of man.The correct development of the fetus depends on the state of the baby's brain. During ultrasound, the doctor pays special attention to the study of the child's head, calculates the BDP of the fetus for weeks. This determines how correctly the fetus develops. Biparietal size is the distance from the temple to the child's temple, measured along the minor axis. That is, a kind of "width" of the head. Another important indicator of ultrasound is the distance from the forehead to the nape along the major axis (LZR). But biparietal size is crucial during pregnancy. It is quite accurate to install it for a period of 12 to 28 weeks. In addition to the fact that the BDP of the fetal head speaks of the correct intrauterine development of the baby, it indicates the possibility of physiological birth. In the case of serious abnormalities, the issue of delivery by caesarean section may arise.
Biparietal size - norms of indications
To the doctor it was easier to navigate inindicators of the norm and pathology, special tables have been developed. They show the average rates of biparietal size using percentiles. This is the medical statistics, which indicate the upper (95 pr.) And the lower limit (5 pr.), As well as the average indicators (50 pr.). How to determine the norm of BDP fetus for weeks? The table represents percentile indices. The doctor finds the 50th value and looks at the boundaries of the extreme readings. For example, at 12 weeks the norm of the BPR is 21 mm. The permissible deviations are 18-24 mm. Therefore, Mom should not worry if she sees in the protocol, for example, the value of BPR 21 or 22. The main thing is that they are less than the upper limit.
Danger of deviations
Sometimes the doctor sees that the BDP of the fetus isweeks do not enter the permissible limits. What can it talk about? For the beginning the expert estimates also other parameters of a fetus (a circle of a stomach, length of a femur, etc.). If all the indicators go beyond the norm, it can talk about a large fruit or about a spasmodic growth. In the second case, with repeated ultrasound in a couple of weeks, the numbers are likely to equalize. If the BDP of the fetal head strongly exceeds the norm, it can talk about serious problems with the health of the baby. The increased size occurs with tumors of the brain or other malignant formations, cerebral hernia, hydrocephalus. In the latter case, a woman's pregnancy is taken under special control. As a rule, the treatment is prescribed. In especially difficult situations, the question of termination of pregnancy is raised.
