Ultrasonography in Pregnancy

1st TRIMESTR (FIRST 3 MONTHS) 11-14 WEEKS OBSTETRIC (Pregnancy) ULTRASONOGRAPHY

It is the screening examination performed when the head-butt distance measurement of the baby is between 45 mm-84 mm, that is, between 11 weeks, 3 days and 14 weeks and 3 days of gestation.

In this examination, the baby’s nuchal translucency (nuchal translucency or more commonly called nuchal translucency in the community) is measured, and the presence or absence of nasal (nasal) bone is detected. The presence of fetal gastric juice and the dimensions of the urinary bladder are evaluated. In general, the shape of the baby’s body, the integrity of the anterior abdominal wall, arms and legs are reviewed.

With this evaluation, the current risk ratio of the baby is determined in terms of some hereditary-chromosomal diseases by interpreting the biochemical data of the dual screening test and the current risk ratios depending on the maternal age. Its importance is that it guides further diagnostic investigations in high-risk situations.

In addition, with the measurement of bilateral uterine artery (uterine artery) resistances, a risk situation can be predicted in terms of high blood pressure in the mother, preeclampsia (metabolic disorder described as pregnancy poisoning in the community), decrease in amniotic fluid in the baby, growth-development retardation in the following weeks of gestation.

2. TRIMESTR (SECOND 3 MONTHS) OBSTETRIC (Pregnancy) ULTRASONOGRAPHY

This examination, which can also be called fetal anomaly scan or detailed pregnancy ultrasound, is a detailed ultrasound examination in which the organs and anatomical structures of the developing baby in the womb are evaluated in terms of congenital anomalies (injuries).

What is meant by ultrasound examinations, which are called color ultrasound, 3 or 4 dimensional ultrasound in the community, is actually this examination performed for the purpose of anomaly screening.

It is recommended for this examination to be done between 18-24 weeks, more ideally between 20-22 weeks, if possible, for every pregnant woman.

In the scan, the morphological structures of the baby and its organs are examined. It is checked whether there is a positive finding in terms of hereditary diseases that can be detected in the mother’s womb. If an anomaly incompatible with life is detected in the presence of current findings, it may be possible to terminate the pregnancy in the presence of other further investigations. In case of detection of other anomalies compatible with life, early diagnosis of these anomalies provides the chance for early intervention and treatment in some of them.

In addition, with the measurement of bilateral uterine artery (uterine artery) resistances, a risk situation can be predicted in terms of high blood pressure in the mother, preeclampsia (metabolic disorder described as pregnancy poisoning in the community), decrease in amniotic fluid in the baby, growth-development retardation in the following weeks of gestation.

3. TRIMESTR (LAST 3 MONTHS) COLOR DOPPLER OBSTETRIC (Pregnancy) ULTRASONOGRAPHY

It is an ultrasound examination performed between 24-36 weeks. If an abnormality is detected in the uterine artery evaluations in the 1st and 2nd trimesters, this examination should be performed in terms of follow-up and conditions such as decrease in amniotic fluid that may develop in the baby, growth-development retardation, and deterioration in the baby’s blood circulation. In addition, ultrasound findings (for example, the width of the renal collecting system) detected in earlier examinations and requiring follow-up are evaluated with the examination performed between these weeks.

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