There are no special tests required during the 14th week of pregnancy, however, if an expectant mother experience any problems with the course of pregnancy, a doctor may designate to pass ultrasound examination with the aim to make sure that the indicators of development of the future child correspond to the norms.
Estimation is compiled on the basis of parameters such as the diameter of the abdominal and thoracic fetal cells, thigh length, and biparietal size. Biparietal diameter – is the actual distance between the opposite walls (outer contour) of the parietal bones of the skull.
This characteristic the head size of the future baby is important to assess the possibility of passing through the birth canals. The increasing in size of the skull is a sign of brain development and can indicate by its size, whether the development goes normally or not.
Also at the 14th week of pregnancy the ultrasound examination can evaluate the development of the baby’s bones: the elbows, shoulders, radius, peroneal and tibial, feet and hands. Ultrasound examination may also evaluate the work of the internal organs such as the heart, kidneys, stomach, bladder and intestines.
Most often, the first screening – examination, with the help of which it is possible to detect in time any disease or pathologies in the development of the future baby – (is carried out at the 12th week of gestation).
Screening includes a biochemical analysis of blood and ultrasound examination of the neck area of the future baby. The most telling period for measuring the size of a collar zone is precisely the period of the 12th week, as this parameter is quite unstable and varies depending on the growth and development of the fetus.
If the expectant mother has not passed the first screening test, it can be done later, because it will not be informative during this period. The second screening is necessary to pass on the 17th or 18th week of pregnancy. You will have to donate blood from a vein for the three hormones b-HCG, AFP and free estriol, as well as re-visit the ultrasound examination.