Ultrasound during pregnancy can be carried out several times, while future mothers are often disturbed by the questions: how often can ultrasound do and is it harmful if this study is harmful for a child. For the entire existence of the method, not a single case of a negative impact on the developing fetus organism was revealed. However, despite all the harmlessness of the methodology, the term of the first ultrasound of a pregnant woman determines the doctor.
With ultrasound, a biochemical blood test is carried out, as well as other diagnostic studies.
The main question that worries every future mother: "At what time of the 2nd trimester during pregnancy, you need to do the second screening ultrasound?" There are specific deadlines for this survey - 20-24th week of pregnancy. In cases where the first ultrasound showed any violations in the process of fetal development or blood test results have deviations from the norm, the second screening can be carried out earlier than 20 weeks (for example, on the 16-17th week).
With the second screening, the second ultrasound is appointed. During which the doctor turns out information on how many fruit women, that is, whether pregnancy is multiply, the term of pregnancy is specified. Sometimes it is different, which determined the first result. The doctor also reports the estimated date of birth and, if the woman is desired, can say half a child.
As a result, the doctor issues a conclusion about the state of the fetus, the presence of violations in development. If deviations from the norm on the ultrasound are revealed, then the woman is recommended to undergo a study with Doppler. This diagnosis will allow you to evaluate the patency of blood vessels, uterine, placental, arterial blood flow. As well as the degree of saturation of the baby's cerebral oxygen at a given period of time.
Important! To get the most accurate diagnosis, the ultrasound of 2 trimester should be held twice with Doppler, with a break in two weeks. Moreover, the examination is desirable to go through two different devices.
During this period, the majority of the fruit pathologies unnoticed in the first trimester are clearly visible. When finding incompatible and significantly increasing defects, you can still abandon pregnancy. The law provides such a right in the presence of serious indications. If the ultrasound of the second trimester shows the risks of miscarriage or early childbirth, the gynecologist appoints events capable of preventing the tragedy. It can be clearly seen during this period and multipleness.
The second trimester of pregnancy lasts 14 weeks from the 12th to the 28th. During this period, two types of research are conducted:
Extractoring ultrasound in the second trimester is appointed by an obstetrician-gynecologist and the danger to no pregnant woman or for the fetus. You can do the ultrasound of the fetus as much as it is necessary.
Ultrasonic diagnostics in 2 trimester makes all future mothers. If there are no risks, the doctor nevertheless it is necessary to evaluate the development of the fetus, to own information on the growth and set of the child's mass, how adequately all its bodies are formed. In addition, it is important to monitor the state of the mother's placenta, which is now, during these periods of pregnancy is actively transformed to ensure the baby with the necessary nutrition substances, to implement the need for oxygen.... .
The fence of venous blood for biochemical analysis will be recommended to carry out only those women in which there are some risks of the formation of anomaly or previous screening results, surveys for hormones at the beginning of pregnancy were dubious.
Ultrasonic Study of the second trimester is necessary to study patient and fetometry health indicators. Fetometry is a fruit examination in order to determine its size, mass and proportions. These parameters clearly indicate the quality of the development of the child.
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