At the 22nd week the screening examination is no longer performed: a woman should be examined earlier and the next ultrasound is prescribed at 31 weeks. And at 22 weeks, ultrasound is done by those pregnant women who were not examined earlier or according to the indications. The truth during this period can conduct additional ultrasound examinations and consultations in medical centers, if previously congenital malformations of the fetus were suspected. To do this, appoint a normal or 3-D ultrasound, and 22 weeks of pregnancy is suitable for examination, since late abortion for medications is allowed up to 24 weeks.
22 week of pregnancy - ultrasound parameters
The results of ultrasound at the beginning of 22 weeks of pregnancy or when it is already 22-23 weeks are slightly different. The main dimensions, which are measured at 21-23 weeks:
- BDP (biparietal size of the skull) - from 51.6 - 54.2 to 54.2 - 57.5 mm;
- DB (length of the thigh) - from 35.3 - 38.3 to 67 - 70 mm;
- LTE (frontal parietal size of the skull) - from 64 - 67 to 38.3 - 41.3 mm;
- SJ (mean abdomen diameter) - from 52.5 - 56.4 to 49.4 - 52.6 mm;
- SDHK (average diameter of the chest) - from 46.4 - 49.4 to 56.4 - 59.3 mm.
The normal placenta at this time is uniform and has a thickness of 26-28 mm. The column of amniotic fluid in a place free from the umbilical cord and parts of the fetus is 35-70 mm. The heart clearly visible all the chambers and valves,
The structure of the brain is well visible, the width of the lateral ventricles is not more than 10 mm. You can see the liver, kidneys, stomach, bladder and intestine of the fetus. The umbilical cord clearly shows all the vessels, but its presence in the neck does not say anything: the position of the fetus is still unstable and it actively moves freely turning in the uterine cavity.
22 week of pregnancy is the period when the sex of the child is seen by ultrasound , and the parameters of boys and girls differ little in size.