During the ultrasound, the various sizes of the fetus , which characterize how the fetus is formed, are necessarily determined. Each period of gestation corresponds to a certain size, changing them in the direction of increase or decrease makes you think about the pathological course of pregnancy. In this article we will consider what is the coccyx-parietal size of the fetus, what does it say and how should it be normal?
What is the CTE of the fetus?
The coccyx-parietal fetal size is determined by ultrasound examination and comparing it with the body weight of the fetus, determine the duration of pregnancy and compare it with the term calculated by the last menstruation. This indicator has an important diagnostic value before the eleventh week of pregnancy (in some cases until the thirteenth week), after which the definition of other fetal sizes will come first. The method of measuring the coccygeal-parietal size of the fetus is quite simple, and consists in determining the distance from the parietal bone to the coccyx. It is noted that the indicator of coccygeal-parietal size is directly proportional to the duration of pregnancy, that is, the longer the period, the higher the KTR index.
Ultrasound of the fetus - KTR
To determine the coccygeal-parietal size by ultrasound, it is necessary to scan the uterus in various projections and to find the one on which the length of the embryo will be greatest. On this scan, the coccygeal-parietal size should be determined. Due to the determination of the coccygeal-parietal fetal size by ultrasound, the estimated date of delivery is established.
Coccygeal parietal size - norm
To determine whether the embryo corresponds to the gestation period, tables have been developed and compiled which indicate the specific value of the coccygeal-parietal size for which gestation period. Thus, the CT of the fetus of 5 mm corresponds to the 5th week of pregnancy, and the CT of the fetus of 6 mm corresponds to the sixth week of pregnancy. If we follow this indicator further, we can see another trend. Thus, the CTE of the fetus at 7, 8 and 9 weeks of gestation is 10 mm, 16 mm and 23 mm, respectively. A KTR fetus 44 mm is observed in normal at 11 weeks of gestation. If, for example, at 12 weeks of gestation, the size of the feces of the coccygeal parietal is 52 mm, and at week 13 it corresponds to 66 mm, this indicates an accelerated growth of the embryo.