In the first trimester ultrasound is done for a period of 11-13 weeks. Doctor, measuring separately size, nuchal translucency thickness, the length of the fetus from crown to rump and conducting a study of section of the bones of the skull, is able with sufficient accuracy to suggest the presence of anomalies neural tube, brain and chromosomal mutations. Atresia of the duodenum, renal anomalies, hernia of the spinal cord and brain, defects abdominal ─ objective ultrasound data is enough to identify these anomalies. Themselves the ugliness may not be visible, the conclusion is based on the statistical data. Since the limbs are already formed, that on pen ultrasound their visible defects.
For the term of 20 weeks is clearly visible smaller deformities ─ pathology of the skeletal system, pathology of the brain and gross malformations of the heart. Hydrocephalus, anecephaly, the lack of eyes in the fetus, absence of fingers or extra fingers on the upper and lower extremities, visible features of the development of Siamese twins, which allows doctors to change the tactics of management of pregnancy ─ after surgery these children, albeit different from the other, but it may take care of themselves, mental activity is rarely. Ultrasound at 20 weeks to do and in order to confirm or refute the data of the first ultrasound. The fact is that hernia that the doctor will see the first ultrasound, can be independent pathologies, in this case, successfully treated, and can be a part of the manifestations of Edwards syndrome ─ this defect considered incompatible with life. At this period a well marked abnormalities of the genital organs.
At 32-34 weeks, the doctor is able to see the violation that previously did not show. These violations do not require an active action before the birth. But the woman can be given a direction to a specialized hospital, where the child will assist in the first hours of life. It could be a bowel obstruction, for example, structurally unstable heart defects, abnormalities in the urinary system. Such diseases are eliminated immediately after birth or in a planned manner and the child grows healthy. At 32-34 weeks to confirm the presence of cleft palate (cleft palate). Modern facial surgery eliminates this defect in the first 6-12 months of a child's life.
Ultrasound does not give a 100% guarantee. Often it is necessary to do again while may be invited specialists of different levels. This is important, as timely diagnosis of severe deformities that make the child viable, allow you to terminate the pregnancy in time. The birth of children with complex defects ─ even more stressful than the interruption. In this case, equally hard and mother and child. The child is in pain, often die in the first months after birth.