One of the studies that are carried out during pregnancy is fetal TB , which stands for the thickness of the collar space. The determination of TBP is performed using an ultrasound machine. The study is carried out during pregnancy from 11 to 14 weeks. At an earlier time the test can not be carried out, and after 14 weeks the study will not give a reliable result. The definition of fetal TB is not dangerous for the mother and child. The study is carried out by the usual or transvaginal method.
What is FGP of fetus?
This value indicates the amount of fluid between the inner surface of the skin and the outer surface of the tissues that cover the cervical spine of the fetus. The definition of TB is performed in order to reveal the presence of fetal development pathologies, namely Down syndrome , Turner syndrome, Patau syndrome and Edwards syndrome.
In assessing the degree of risk, background factors such as the age and health of the expectant mother are taken into account. However, according to the results of this analysis, an accurate diagnosis is not made, for this there are more detailed studies. If the result of fetal TBE shows abnormalities, this is an excuse to do an amniocentesis and a chorionic villus biopsy - tests that accurately confirm or disprove the presence of pathology. These studies are risky and can provoke premature birth (miscarriage).
Fetal TVP by week is the norm
The norm of the TBI at the 11th week of pregnancy is 1-2 mm, and at 13 weeks - 2.8 mm. However, deviations from the norm - this is not a reason to panic. If statistics are to be believed, in the thickness of the collar space of 3 mm, chromosomal abnormalities are diagnosed in 7% of the fetuses, in TVP in 4 mm - in 27% and in TVP in 5 mm - in 53% of the fetuses. An increase in TSS in a fetus is an occasion to prescribe additional examinations. The higher the deviation from normal, the more likely the development of pathology in the fetus.