Is 4D ultrasound the same as big anomaly scan? In fact, they are different types of examinations. 4D ultrasound is used to observe the external appearance of the fetus, and can see the growth and development status of the baby. However, big anomaly scan is used to observe whether the baby has any diseases, which is a different type of examination. Mommy shouldn’t mix them up.

Is four-dimensional color Doppler ultrasound the same as large anomaly scan? Four-dimensional color Doppler ultrasound is the same as large anomaly scan.

Four-dimensional color Doppler ultrasound is different from large anomaly scan. Large anomaly scan is to look at the internal organs of the baby, while four-dimensional color Doppler ultrasound is to look at the five senses and limbs. In addition to four-dimensional color Doppler ultrasound, large anomaly scan also has other items, generally 16-35 weeks can take four-dimensional color Doppler ultrasound, after 35 weeks the baby enters the pelvis and cannot be taken, but some babies enter the pelvis late, and it can be tried.

Firstly, four-dimensional color Doppler ultrasound mainly examines facial malformations: during the examination, the main observation is whether the baby’s eyes and orbits are equal in size and shape, as well as the precise measurement of the interocular distance, and whether the hard palate, soft palate, and upper lip arc curve are continuous. Next, the neck of the fetus is examined to see if there are any abnormal lumps. The screening of spinal deformities requires careful observation of whether the spine has protuberances, whether the light strips are broken, whether the arrangement is disordered, and whether there are hard lumps at the sacral tail. Other malformations such as abdominal and body malformations can also be discovered by careful observation.

Secondly, four-dimensional color Doppler ultrasound mainly examines the central nervous system: anencephaly, hydrocephalus, microcephaly, spina bifida, and meningocele. In the fetal abnormality screening examination of four-dimensional color Doppler ultrasound, the first thing to screen is the head malformation. During the examination, the operator will carefully observe the shape of the fetal head, the brain tissue (midbrain, thalamus, cerebellar vermis, posterior cranial fossa, lateral ventricles), and the distance between the central line and the two sides of the skull plates, and screen for conditions such as anencephaly, exencephaly, and hydrocephalus.

Four-dimensional color Doppler ultrasound mainly examines the urinary system, hydronephrosis, polycystic kidney, megacolon, urethral obstruction, and other conditions. Most importantly, it mainly examines the digestive tract: umbilical hernia, organ prolapse, intestinal atresia, and megacolon, among others. Short-limb malformation, fused malformation, congenital heart disease, and fetal abnormality diseases, etc.

When to perform four-dimensional color Doppler ultrasound

In addition to allowing expectant parents to meet their unborn baby early, the most critical function of four-dimensional color Doppler ultrasound is that it can conduct various examinations on the fetus, detect problems in fetal growth early, such as cleft lip and palate, spina bifida, etc. Moreover, the image display of four-dimensional color Doppler ultrasound is clearer and more accurate than traditional B-ultrasound and B-ultrasound. Therefore, for the health of both the pregnant woman and the fetus, it is very necessary to choose to perform a four-dimensional color Doppler ultrasound examination during prenatal checks.

1, Four-dimensional color Doppler ultrasound can be performed at any stage of pregnancy. However, it should be noted that there is currently some controversy about whether four-dimensional B-ultrasound can be performed before the early pregnancy period (before 12 weeks of pregnancy). For safety reasons, it is recommended to perform a four-dimensional color Doppler ultrasound for the fetus after 20 weeks of pregnancy.

2, The baby in the womb has already completed all its growth and development of various vital organs after 20 weeks of pregnancy. The best time for examination is between 24 and 28 weeks of pregnancy, as the fetal structure has already formed. The size of the fetus and the amniotic fluid of the pregnant woman are moderate, the bone echo of the fetus is relatively small, and the image is clear, so this stage is the most ideal period for conducting fetal abnormality examination, which can detect the vast majority of malformations.