Today, every pregnant woman has the opportunity to bear a healthy fetus, because modern equipment can diagnose not only the gestational age, but also exclude the possibility of developing some deviations or pathologies in the development of the unborn baby. So, determining the age of the fetus, obstetricians take a large number of measurements and compare the results with the established values. The most accurate parameter that determines the development of the future baby is the CTE of the fetus, that is, its coccygeal-parietal size. It is measured using ultrasound, most often for up to eleven weeks, since the accuracy of measurements decreases from the twelfth week. According to the KTR of the embryo, you can determine not only the duration of pregnancy, but also the size and approximate weight of the baby.
The special table presents the CTE values of the fetus by weeks, they are an average indicator of the norm, since small fluctuations in the development of the unborn child are allowed, which are not any deviations. This is especially true in the second trimester. Once again, we emphasize that the table allows a normal error of four days when calculating the gestational age. After sixteen weeks, the CTE of the fetus is not measured.
It is important here not only to correctly set the gestational age, but also to monitor the development of the child. In case of significant deviations from the norm, it is necessary to consult a doctor and only to decipher the results with him.
If we look at the KTR table by weeks, it immediately catches the eye that after the eleventh week the indicators in it almost double. So, if previously KTR increased by 1 mm, then after the twelfth week it will grow by almost 2 mm (per day).
The most optimal is the measurement of fetal CTE at the eleventh week, since early diagnosis makes it possible to determine malformations in their early stages, this makes it possible to eliminate them and bear a healthy pregnancy.
Let's consider how KTR is determined
Scanning in different planes is used to determine KTR, and the largest embryo length is determined by measuring from the cranial pole to the edge of the buttocks (gall sac and limbs are not included here).
Thus, in the first trimester of pregnancy , ultrasound determines the diameter of the fetal egg and the coccygeal-parietal size of the fetus. These all measurements make it possible to accurately determine the gestational age, since during this period the dimensions of the future baby are most close to standards.
If we look at the table for measuring the CTE of the fetus, we can see that for six weeks it is seven millimeters, by the seventh week this indicator grows to ten millimeters, at the beginning of the eighth week - sixteen millimeters, at the ninth - twenty three millimeters, the tenth week is characterized by indicators thirty-one millimeters, and the eleventh is forty millimeters.
From the twelfth week of pregnancy, the KTP indicators of the embryo will grow at a slightly higher pace, already this week they are equivalent to fifty-two millimeters. The thirteenth week is inherent in the KTR of sixty-six millimeters.
Thus, the study of CTE of the fetus plays an important role in the study of the course of pregnancy of a woman. Thanks to this indicator, it is possible not only to determine the exact gestational age, but also to identify deviations in the development of the embryo at an early stage, which, in turn, increases the chances of eliminating them and bearing a healthy baby.
It should be noted that it is not recommended to independently determine the size of the fetus according to the results of ultrasound, leave it to experienced specialists, and then you will know about the real state of your future baby.