What this - TVP fetus - every future mother will find out during pregnancy from the eleventh to the fourteenth week. Fetal TVP is a measurement of the occipital fold. Using ultrasound, the thickness of the area between the skin and the soft tissues of the fetal neck is determined. The increase in this zone indicates the development of genetic pathologies. The norm of the fetal TVP by week is indicated in the table below.
Together with the fetal TB in 12 weeks on ultrasound determine the presence of the nasal bone, which, with normal fetal development, should form up to the tenth week. Since in children with chromosomal pathologies ossification occurs more slowly, the absence of a formed nasal bone can also be indicative of this disease.
| Term of pregnancy, weeks. | Thickness of collar space, mm | ||
|---|---|---|---|
| 5th percentile | 50th percentile | 95th percentile | |
| 10 weeks. 2 days - 10 weeks. 6 days | 0.8 | 1.5 | 2.2 |
| 11ed. 2 days - 11 weeks. 6 days | 0.8 | 1.6 | 2.2 |
| 12 weeks. 2 days - 12 weeks. 6 days | 0.7 | 1.6 | 2.5 |
| 13 weeks. 2 days - 13 weeks. 6 days | 0.7 | 1.7 | 2.7 |
On the dates after the fourteenth week, it is more difficult to determine this pathology, because the lymphatic system begins to function in the child and excess fluid is absorbed.
Expansion of the TBE in the fetus
Increased TBE in the fetus indicates a pathology such as Down syndrome . To determine this particular pathology, this research is carried out. To detect the presence of other genetic abnormalities, perform a full ultrasound screening.
Pregnant women with an age of thirty-five have an increased risk of having a child with genetic pathologies. Therefore, doctors always recommend that they undergo prenatal diagnosis to make sure that the fetus's TVP is normal. According to statistical data, the risk of an increase in TBC in a fetus in pregnant women is thirty-five years old at 1:1350, in women after thirty-five years of age it is 1: 1380, and in women over forty, 1: 100.